What did we talk about last time? Examples switch statements

Size: px
Start display at page:

Download "What did we talk about last time? Examples switch statements"

Transcription

1 Week 4 - Friday

2 What did we talk about last time? Examples switch statements

3

4

5

6 History of computers Hardware Software development Basic Java syntax Output with System.out.print()

7 Mechanical Calculation Devices (2400BC onward) Aid to human calculation No stored program Mechanical Computers (1725 onward) Punch card programming Serious limitations Early Electronic Computers (1941 onward) General purpose, stored program computers Electronic, using vacuum tubes Microprocessors (1970's onward) Succeeded transistors Now billions of computations per second at a nanometer scale

8 Cache Actually on the CPU Fast and expensive RAM Primary memory for a desktop computer Pretty fast and relatively expensive Flash Drive Faster than hard drives Seen on USB drives but SSDs are becoming common too Hard Drive Secondary memory for a desktop computer Slow and cheap Optical Drive Secondary memory that can usually only be written once Very slow and very cheap

9 Storage for all the data and instructions on your computer Modern computers store everything as binary digits (bits) which have a value of 0 or 1. 1 byte = 8 bits 1 kilobyte (kb) = 2 10 bytes 1 megabyte (mb) = 2 20 bytes 1 gigabyte (gb) = 2 30 bytes 1 terabyte (tb) = 2 40 bytes

10 Monitor Common visual output device Speakers Common audio output device Mouse Common input device Keyboard Common input device

11 Source Code Machine Code Hardware Computer! Solve a problem; Execute

12 Java Source Code Java Bytecode Machine Code Hardware class A { Problem p; p.solve(); } JVM

13 Often goes through phases similar to the following: 1. Understand the problem 2. Plan a solution to the problem 3. Implement the solution in a programming language 4. Test the solution 5. Maintain the solution and do bug fixes Factor of 10 rule!

14 The absolute smallest program possible, with a print statement public class Hello { public static void main(string[] args) { System.out.println("Hello, world!"); } }

15 For example, instead of one print statement, we can have several: System.out.println("Hello, world!"); System.out.println("Hello, galaxy!"); System.out.println("Goodbye, world!"); Each statement is an instruction to the computer They are printed in order, one by one

16 Java is a case sensitive language Class is not the same as class System.out.println("Word!"); prints correctly system.out.println("word!"); does not compile

17 Java generally ignores whitespace (tabs, newlines, and spaces) System.out.println("Hello, world!"); is the same as: println( System.out. "Hello, world!"); You should use whitespace effectively to make your code readable

18 There are two kinds of comments (actually 3) Single line comments use // System.out.println("Hi!"); // this is a comment Multi-line comments start with a /* and end with a */ System.out.println("Hi!"); /* this is a multi-line comment */

19 Binary representation Basic data types Using Scanner for input

20 The binary number system is base 2 This means that its digits are: 0 and 1 Base 2 means that you need 2 digits to represent two, namely 1 and 0 Each place in the number as you move left corresponds to an increase by a factor of 2 instead of 10

21 Sixty fours 256 s Sixteens Fours 1024 s Ones 512 s Twos 128 s Eights Thirty twos

22 We're focusing on five basic types of data in Java These are: int double boolean char String For whole numbers For rational numbers For true or false values For single characters For words String is a little different from the rest, since you can call methods on it (and for other reasons)

23 Type Kind of values Sample Literals int double boolean char Integers Floating-point Numbers Boolean values Single characters e23 true false 'A' 'Z' '&' String Sequences of characters "If you dis Dr. Dre" "10 Sesquipedalians"

24 The int type is used to store integers (positive and negative whole numbers and zero) Examples: Inside the computer, an int takes up 4 bytes of space, which is 32 bits (1's and 0's)

25 You will use the int type very often Sometimes, however, you need to represent numbers with a fractional part The double type is well suited to this purpose Declaration of a double variable is just like an int variable: double x;

26 Numbers are great But, sometimes you only need to keep track of whether or not something is true or false This is what the boolean type is for Hopefully you have more appreciation for booleans now Declaration of a boolean variable is like so: boolean value;

27 Sometimes you need to deal with characters This is what the char type is for The char type only allows you to store a single character like '$' or 'q' Declaration of a char variable is like so: char c;

28 The String type is different from the other types in several ways The important thing for you to focus on now is that it can hold a large number of chars, not just a single value A String literal is what we used in the Hello, World program String word;

29 There are three parts to using Scanner for input 1. Include the appropriate import statement so that your program knows what a Scanner object is 2. Create a specific Scanner object with a name you choose 3. Use the object you create to read in data

30 Lots of people have written all kinds of useful Java code By importing that code, we can use it to help solve our problems To import code, you type import and then the name of the package or class To import Scanner, type the following at the top of your program (before the class!) import java.util.scanner;

31 Once you have imported the Scanner class, you have to create a Scanner object To do so, declare a reference of type Scanner, and use the new keyword to create a new Scanner with System.in as a parameter like so: Scanner in = new Scanner(System.in); You can call it whatever you want, I chose to call it in Doesn't make any sense? For now, that's okay.

32 Now that you've got a Scanner object, you can use it to read some data It has a method that will read in the next piece of data that user types in, but you have to know if that data is going to be an int, a double, or a String Let's say the user is going to input her age (an int) and you want to store it in an int variable called years We'll use the nextint() method to do so: int years; years = in.nextint();

33 Scanner has a lot of methods (ways to accomplish some tasks) For now, we're only interested in three These allow us to read the next int, the next double, and the next String, respectively: Scanner in = new Scanner(System.in); int number = in.nextint(); double radius = in.nextdouble(); String word = in.next();

34 Numerical operations Advanced math operations boolean operations char operations String operations Wrapper classes

35 + adds - subtracts * multiplies / divides (integer division for int type and fractional parts for double type) % finds the remainder

36 Order of operations holds like in math int a = 31; int b = 16; int c = 1; int d = 2; a = (((b + c) * d) a / b) / d; You can use parentheses to clarify or change the precedence Now a is 16

37 You cannot directly store a double value into an int variable int a = 2.6; // fails! However, you can cast the double value to convert it into an int int a = (int)2.6;// succeeds! (a = 2) Casting tells the compiler that you want the loss of precision to happen You can always store an int into a double

38 The sin() method allows you to find the sine of an angle (in radians) This method is inside the Math class The answer that it gives back is of type double To use it, you might type the following: double value = Math.sin( 2.4 );

39 In Java, the conversion of a double into an int does not use rounding As in the case of integer division, the fractional part is dropped For positive numbers, that's like using floor For negative numbers, that's like using ceiling The right way to do rounding is to call Math.round() double x = 2.6; int a = (int)math.round(x); // rounds

40 Return type Name Job double sin( double theta ) Find the sine of angle theta double cos( double theta ) Find the cosine of angle theta double tan( double theta ) Find the tangent of angle theta double exp( double a ) Raise e to the power of a (e a ) double log( double a ) Find the natural log of a double pow( double a, double b ) Raise a to the power of b (a b ) long round( double a ) Round a to the nearest integer double random() Create a random number in [0, 1) double sqrt( double a ) Find the square root of a double todegrees( double radians ) Convert radians to degrees double toradians( double degrees ) Convert degrees to radians

41 ! NOT Flips value of operand from true to false or vice versa && AND true if both operands are true OR true if either operand is true ^ XOR true if operands are different

42 In some circumstances, Java doesn't check the whole expression: (true (some complicated expression)) Ignores everything after and gives back true (false && (some complicated expression)) Ignores everything after && and gives back false

43 char values can be treated like an int int number; number = 'a'; // number contains 97 It can be more useful to get the offset from a starting point char letter = 'r'; int number; number = letter 'a' + 1; //number is 18

44 Remember that we use single quotes to designate a char literal: 'z' What if you want to use the apostrophe character ( ' )? apostrophe: '\'' What if you want to use characters that can't be printed, like tab or newline? tab: newline: '\t' '\n' The backslash is a message that a special command called an escape sequence is coming These can be used in String literals as well: "\t\t\t\nthey said, \"Wow!\""

45 The only operator that we will use directly with Strings is the + (concatenation) operator This operator creates a new String that is the concatenation of the two source Strings Concatenation can be used to insert the values of other types into Strings as well String word; word = "tick" + "tock"; // word is "ticktock"

46 equals() Tests two Strings to see if they are the same compareto() Returns a negative number if the first String comes earlier in the alphabet, a positive number if the first String comes later in the alphabet, and 0 if they are the same length() Returns the length of the String charat() Returns the character at a particular index inside the String substring() Returns a new String made up of the characters that start at the first index and go up to but do not include the second index

47 Each primitive data type in Java has a wrapper class Integer Allows String representations of integer values to be converted into ints Double Allows String representations of floating point values to be converted into doubles Character Provides methods to test if a char value is a digit, is a letter, is lower case, is upper case Provides methods to change a char value to upper case or lower case

48 Making choices with if statements Basics Having if bodies with more than one line Using else blocks Nesting if statements Using switch statements

49 The if part Any boolean expression if( condition ) statement; Any single executable statement

50 if( condition ) statement1; else statement2; Two different outcomes

51 if( condition ) { statement1; A whole bunch of statements statement2; statementn; }

52 if( condition1 ) { } statement1; if( condition2 ) { if( condition3 ) statement2; }

53 The most common condition you will find in an if is a comparison between two primitive types In Java, that comparison can be: ==!= < <= > >= equals does not equal less than less than or equal to greater than greater than or equal to

54 switch( data ) { case value1: statements 1; case value2: statements 2; case valuen: statements n; default: default statements; }

55 int data = 3; switch( data ) { case 3: System.out.println("Three"); case 4: System.out.println("Four"); break; case 5: System.out.println("Five"); } The default is optional too Both "Three" and "Four" are printed The break is optional

56 1. The data that you are performing your switch on must be either an int, a char, or a String 2. The value for each case must be a literal 3. Execution will jump to the case that matches 4. If no case matches, it will go to default 5. If there is no default, it will skip the whole switch block 6. Execution will continue until it hits a break

57

58

59 Exam 1

60 Study for Exam 1 Keep working on Project 1, due tonight by 11:59! Never look at another student's code

What did we talk about last time? Math methods boolean operations char operations

What did we talk about last time? Math methods boolean operations char operations Week 3 - Wednesday What did we talk about last time? Math methods boolean operations char operations For Project 1, the easiest way to print out data with 2 decimal places is put "%.2f" in the formatting

More information

CSCI 2010 Principles of Computer Science. Data and Expressions 08/09/2013 CSCI

CSCI 2010 Principles of Computer Science. Data and Expressions 08/09/2013 CSCI CSCI 2010 Principles of Computer Science Data and Expressions 08/09/2013 CSCI 2010 1 Data Types, Variables and Expressions in Java We look at the primitive data types, strings and expressions that are

More information

Data and Expressions. Outline. Data and Expressions 12/18/2010. Let's explore some other fundamental programming concepts. Chapter 2 focuses on:

Data and Expressions. Outline. Data and Expressions 12/18/2010. Let's explore some other fundamental programming concepts. Chapter 2 focuses on: Data and Expressions Data and Expressions Let's explore some other fundamental programming concepts Chapter 2 focuses on: Character Strings Primitive Data The Declaration And Use Of Variables Expressions

More information

Full file at

Full file at Java Programming: From Problem Analysis to Program Design, 3 rd Edition 2-1 Chapter 2 Basic Elements of Java At a Glance Instructor s Manual Table of Contents Overview Objectives s Quick Quizzes Class

More information

Expressions and Data Types CSC 121 Spring 2015 Howard Rosenthal

Expressions and Data Types CSC 121 Spring 2015 Howard Rosenthal Expressions and Data Types CSC 121 Spring 2015 Howard Rosenthal Lesson Goals Understand the basic constructs of a Java Program Understand how to use basic identifiers Understand simple Java data types

More information

Define a method vs. calling a method. Chapter Goals. Contents 1/21/13

Define a method vs. calling a method. Chapter Goals. Contents 1/21/13 CHAPTER 2 Define a method vs. calling a method Line 3 defines a method called main Line 5 calls a method called println, which is defined in the Java library You will learn later how to define your own

More information

CMSC131. Introduction to your Introduction to Java. Why Java?

CMSC131. Introduction to your Introduction to Java. Why Java? CMSC131 Introduction to your Introduction to Java Why Java? It s a popular language in both industry and introductory programming courses. It makes use of programming structures and techniques that can

More information

Assoc. Prof. Dr. Marenglen Biba. (C) 2010 Pearson Education, Inc. All rights reserved.

Assoc. Prof. Dr. Marenglen Biba. (C) 2010 Pearson Education, Inc. All rights reserved. Assoc. Prof. Dr. Marenglen Biba (C) 2010 Pearson Education, Inc. All rights reserved. Java application A computer program that executes when you use the java command to launch the Java Virtual Machine

More information

12/22/11. Java How to Program, 9/e. Help you get started with Eclipse and NetBeans integrated development environments.

12/22/11. Java How to Program, 9/e. Help you get started with Eclipse and NetBeans integrated development environments. Java How to Program, 9/e Education, Inc. All Rights Reserved. } Java application programming } Use tools from the JDK to compile and run programs. } Videos at www.deitel.com/books/jhtp9/ Help you get started

More information

Chapter 1. Introduction to Computers and Programming. M hiwa ahmad aziz

Chapter 1. Introduction to Computers and Programming.   M hiwa ahmad aziz . Chapter 1 Introduction to Computers and Programming www.raparinweb.com M hiwa ahmad aziz 1 Ch 1 - Introduction to Computers and Programming Hardware Terminology Main Memory Auxiliary Memory Drives Writing

More information

Expressions and Data Types CSC 121 Fall 2015 Howard Rosenthal

Expressions and Data Types CSC 121 Fall 2015 Howard Rosenthal Expressions and Data Types CSC 121 Fall 2015 Howard Rosenthal Lesson Goals Understand the basic constructs of a Java Program Understand how to use basic identifiers Understand simple Java data types and

More information

COSC 123 Computer Creativity. Introduction to Java. Dr. Ramon Lawrence University of British Columbia Okanagan

COSC 123 Computer Creativity. Introduction to Java. Dr. Ramon Lawrence University of British Columbia Okanagan COSC 123 Computer Creativity Introduction to Java Dr. Ramon Lawrence University of British Columbia Okanagan ramon.lawrence@ubc.ca Key Points 1) Introduce Java, a general-purpose programming language,

More information

Wentworth Institute of Technology. Engineering & Technology WIT COMP1000. Java Basics

Wentworth Institute of Technology. Engineering & Technology WIT COMP1000. Java Basics WIT COMP1000 Java Basics Java Origins Java was developed by James Gosling at Sun Microsystems in the early 1990s It was derived largely from the C++ programming language with several enhancements Java

More information

BASIC COMPUTATION. public static void main(string [] args) Fundamentals of Computer Science I

BASIC COMPUTATION. public static void main(string [] args) Fundamentals of Computer Science I BASIC COMPUTATION x public static void main(string [] args) Fundamentals of Computer Science I Outline Using Eclipse Data Types Variables Primitive and Class Data Types Expressions Declaration Assignment

More information

Chapter. Let's explore some other fundamental programming concepts

Chapter. Let's explore some other fundamental programming concepts Data and Expressions 2 Chapter 5 TH EDITION Lewis & Loftus java Software Solutions Foundations of Program Design 2007 Pearson Addison-Wesley. All rights reserved Data and Expressions Let's explore some

More information

Getting started with Java

Getting started with Java Getting started with Java Magic Lines public class MagicLines { public static void main(string[] args) { } } Comments Comments are lines in your code that get ignored during execution. Good for leaving

More information

Basics of Java Programming

Basics of Java Programming Basics of Java Programming Lecture 2 COP 3252 Summer 2017 May 16, 2017 Components of a Java Program statements - A statement is some action or sequence of actions, given as a command in code. A statement

More information

Review Chapters 1 to 4. Instructor: Scott Kristjanson CMPT 125/125 SFU Burnaby, Fall 2013

Review Chapters 1 to 4. Instructor: Scott Kristjanson CMPT 125/125 SFU Burnaby, Fall 2013 Review Chapters 1 to 4 Instructor: Scott Kristjanson CMPT 125/125 SFU Burnaby, Fall 2013 Introduction to Java Chapters 1 and 2 The Java Language Section 1.1 Data & Expressions Sections 2.1 2.5 Instructor:

More information

CONTENTS: Compilation Data and Expressions COMP 202. More on Chapter 2

CONTENTS: Compilation Data and Expressions COMP 202. More on Chapter 2 CONTENTS: Compilation Data and Expressions COMP 202 More on Chapter 2 Programming Language Levels There are many programming language levels: machine language assembly language high-level language Java,

More information

ECE 122 Engineering Problem Solving with Java

ECE 122 Engineering Problem Solving with Java ECE 122 Engineering Problem Solving with Java Lecture 3 Expression Evaluation and Program Interaction Outline Problem: How do I input data and use it in complicated expressions Creating complicated expressions

More information

The type of all data used in a C (or C++) program must be specified

The type of all data used in a C (or C++) program must be specified The type of all data used in a C (or C++) program must be specified A data type is a description of the data being represented That is, a set of possible values and a set of operations on those values

More information

Important Java terminology

Important Java terminology 1 Important Java terminology The information we manage in a Java program is either represented as primitive data or as objects. Primitive data פרימיטיביים) (נתונים include common, fundamental values as

More information

Lecture 2. COMP1406/1006 (the Java course) Fall M. Jason Hinek Carleton University

Lecture 2. COMP1406/1006 (the Java course) Fall M. Jason Hinek Carleton University Lecture 2 COMP1406/1006 (the Java course) Fall 2013 M. Jason Hinek Carleton University today s agenda a quick look back (last Thursday) assignment 0 is posted and is due this Friday at 2pm Java compiling

More information

Introduction to Software Development (ISD) David Weston and Igor Razgon

Introduction to Software Development (ISD) David Weston and Igor Razgon Introduction to Software Development (ISD) David Weston and Igor Razgon Autumn term 2013 Course book The primary book supporting the ISD module is: Java for Everyone, by Cay Horstmann, 2nd Edition, Wiley,

More information

2/9/2012. Chapter Four: Fundamental Data Types. Chapter Goals

2/9/2012. Chapter Four: Fundamental Data Types. Chapter Goals Chapter Four: Fundamental Data Types Chapter Goals To understand integer and floating-point numbers To recognize the limitations of the numeric types To become aware of causes for overflow and roundoff

More information

4. Java Project Design, Input Methods

4. Java Project Design, Input Methods 4-1 4. Java Project Design, Input Methods Review and Preview You should now be fairly comfortable with creating, compiling and running simple Java projects. In this class, we continue learning new Java

More information

A variable is a name for a location in memory A variable must be declared

A variable is a name for a location in memory A variable must be declared Variables A variable is a name for a location in memory A variable must be declared, specifying the variable's name and the type of information that will be held in it data type variable name int total;

More information

Chapter 2: Data and Expressions

Chapter 2: Data and Expressions Chapter 2: Data and Expressions CS 121 Department of Computer Science College of Engineering Boise State University January 15, 2015 Chapter 2: Data and Expressions CS 121 1 / 1 Chapter 2 Part 1: Data

More information

double float char In a method: final typename variablename = expression ;

double float char In a method: final typename variablename = expression ; Chapter 4 Fundamental Data Types The Plan For Today Return Chapter 3 Assignment/Exam Corrections Chapter 4 4.4: Arithmetic Operations and Mathematical Functions 4.5: Calling Static Methods 4.6: Strings

More information

Programming with Java

Programming with Java Programming with Java Data Types & Input Statement Lecture 04 First stage Software Engineering Dep. Saman M. Omer 2017-2018 Objectives q By the end of this lecture you should be able to : ü Know rules

More information

Lecture Set 2: Starting Java

Lecture Set 2: Starting Java Lecture Set 2: Starting Java 1. Java Concepts 2. Java Programming Basics 3. User output 4. Variables and types 5. Expressions 6. User input 7. Uninitialized Variables 0 This Course: Intro to Procedural

More information

Università degli Studi di Bologna Facoltà di Ingegneria. Principles, Models, and Applications for Distributed Systems M

Università degli Studi di Bologna Facoltà di Ingegneria. Principles, Models, and Applications for Distributed Systems M Università degli Studi di Bologna Facoltà di Ingegneria Principles, Models, and Applications for Distributed Systems M tutor Isam M. Al Jawarneh, PhD student isam.aljawarneh3@unibo.it Mobile Middleware

More information

The type of all data used in a C++ program must be specified

The type of all data used in a C++ program must be specified The type of all data used in a C++ program must be specified A data type is a description of the data being represented That is, a set of possible values and a set of operations on those values There are

More information

Review for Test 1 (Chapter 1-5)

Review for Test 1 (Chapter 1-5) Review for Test 1 (Chapter 1-5) 1. Introduction to Computers, Programs, and Java a) What is a computer? b) What is a computer program? c) A bit is a binary digit 0 or 1. A byte is a sequence of 8 bits.

More information

Lecture Set 2: Starting Java

Lecture Set 2: Starting Java Lecture Set 2: Starting Java 1. Java Concepts 2. Java Programming Basics 3. User output 4. Variables and types 5. Expressions 6. User input 7. Uninitialized Variables 0 This Course: Intro to Procedural

More information

CS 106 Introduction to Computer Science I

CS 106 Introduction to Computer Science I CS 106 Introduction to Computer Science I 05 / 31 / 2017 Instructor: Michael Eckmann Today s Topics Questions / Comments? recap and some more details about variables, and if / else statements do lab work

More information

Hello World. n Variables store information. n You can think of them like boxes. n They hold values. n The value of a variable is its current contents

Hello World. n Variables store information. n You can think of them like boxes. n They hold values. n The value of a variable is its current contents Variables in a programming language Basic Computation (Savitch, Chapter 2) TOPICS Variables and Data Types Expressions and Operators Integers and Real Numbers Characters and Strings Input and Output Variables

More information

Lesson 02 Data Types and Statements. MIT 11053, Fundamentals of Programming By: S. Sabraz Nawaz Senior Lecturer in MIT Department of MIT FMC, SEUSL

Lesson 02 Data Types and Statements. MIT 11053, Fundamentals of Programming By: S. Sabraz Nawaz Senior Lecturer in MIT Department of MIT FMC, SEUSL Lesson 02 Data Types and Statements MIT 11053, Fundamentals of Programming By: S. Sabraz Nawaz Senior Lecturer in MIT Department of MIT FMC, SEUSL Topics Covered Statements Variables Data Types Arithmetic

More information

Computer Components. Software{ User Programs. Operating System. Hardware

Computer Components. Software{ User Programs. Operating System. Hardware Computer Components Software{ User Programs Operating System Hardware What are Programs? Programs provide instructions for computers Similar to giving directions to a person who is trying to get from point

More information

CS 302: Introduction to Programming

CS 302: Introduction to Programming CS 302: Introduction to Programming Lectures 2-3 CS302 Summer 2012 1 Review What is a computer? What is a computer program? Why do we have high-level programming languages? How does a high-level program

More information

First Java Program - Output to the Screen

First Java Program - Output to the Screen First Java Program - Output to the Screen These notes are written assuming that the reader has never programmed in Java, but has programmed in another language in the past. In any language, one of the

More information

Objects and Types. COMS W1007 Introduction to Computer Science. Christopher Conway 29 May 2003

Objects and Types. COMS W1007 Introduction to Computer Science. Christopher Conway 29 May 2003 Objects and Types COMS W1007 Introduction to Computer Science Christopher Conway 29 May 2003 Java Programs A Java program contains at least one class definition. public class Hello { public static void

More information

A Java program contains at least one class definition.

A Java program contains at least one class definition. Java Programs Identifiers Objects and Types COMS W1007 Introduction to Computer Science Christopher Conway 29 May 2003 A Java program contains at least one class definition. public class Hello { public

More information

Lesson 02 Data Types and Statements. MIT 12043, Fundamentals of Programming By: S. Sabraz Nawaz Senior Lecturer in MIT Department of MIT FMC, SEUSL

Lesson 02 Data Types and Statements. MIT 12043, Fundamentals of Programming By: S. Sabraz Nawaz Senior Lecturer in MIT Department of MIT FMC, SEUSL Lesson 02 Data Types and Statements MIT 12043, Fundamentals of Programming By: S. Sabraz Nawaz Senior Lecturer in MIT Department of MIT FMC, SEUSL Topics Covered Statements Variables Constants Data Types

More information

Program Elements -- Introduction

Program Elements -- Introduction Program Elements -- Introduction We can now examine the core elements of programming Chapter 3 focuses on: data types variable declaration and use operators and expressions decisions and loops input and

More information

Methods CSC 121 Fall 2016 Howard Rosenthal

Methods CSC 121 Fall 2016 Howard Rosenthal Methods CSC 121 Fall 2016 Howard Rosenthal Lesson Goals Understand what a method is in Java Understand Java s Math Class and how to use it Learn the syntax of method construction Learn both void methods

More information

Chapter 4 Fundamental Data Types. Big Java by Cay Horstmann Copyright 2009 by John Wiley & Sons. All rights reserved.

Chapter 4 Fundamental Data Types. Big Java by Cay Horstmann Copyright 2009 by John Wiley & Sons. All rights reserved. Chapter 4 Fundamental Data Types Chapter Goals To understand integer and floating-point numbers To recognize the limitations of the numeric types To become aware of causes for overflow and roundoff errors

More information

Methods CSC 121 Spring 2017 Howard Rosenthal

Methods CSC 121 Spring 2017 Howard Rosenthal Methods CSC 121 Spring 2017 Howard Rosenthal Lesson Goals Understand what a method is in Java Understand Java s Math Class and how to use it Learn the syntax of method construction Learn both void methods

More information

Chapter 2: Data and Expressions

Chapter 2: Data and Expressions Chapter 2: Data and Expressions CS 121 Department of Computer Science College of Engineering Boise State University April 21, 2015 Chapter 2: Data and Expressions CS 121 1 / 53 Chapter 2 Part 1: Data Types

More information

MODULE 02: BASIC COMPUTATION IN JAVA

MODULE 02: BASIC COMPUTATION IN JAVA MODULE 02: BASIC COMPUTATION IN JAVA Outline Variables Naming Conventions Data Types Primitive Data Types Review: int, double New: boolean, char The String Class Type Conversion Expressions Assignment

More information

More Things We Can Do With It! Overview. Circle Calculations. πr 2. π = More operators and expression types More statements

More Things We Can Do With It! Overview. Circle Calculations. πr 2. π = More operators and expression types More statements More Things We Can Do With It! More operators and expression types More s 11 October 2007 Ariel Shamir 1 Overview Variables and declaration More operators and expressions String type and getting input

More information

AP Computer Science A

AP Computer Science A AP Computer Science A 1st Quarter Notes Table of Contents - section links Click on the date or topic below to jump to that section Date : 9/8/2017 Aim : Java Basics Objects and Classes Data types: Primitive

More information

AP Computer Science Unit 1. Programs

AP Computer Science Unit 1. Programs AP Computer Science Unit 1. Programs Open DrJava. Under the File menu click on New Java Class and the window to the right should appear. Fill in the information as shown and click OK. This code is generated

More information

int: integers, no fractional part double: floating-point numbers (double precision) 1, -4, 0 0.5, , 4.3E24, 1E-14

int: integers, no fractional part double: floating-point numbers (double precision) 1, -4, 0 0.5, , 4.3E24, 1E-14 int: integers, no fractional part 1, -4, 0 double: floating-point numbers (double precision) 0.5, -3.11111, 4.3E24, 1E-14 A numeric computation overflows if the result falls outside the range for the number

More information

2: Basics of Java Programming

2: Basics of Java Programming 2: Basics of Java Programming CSC 1051 Algorithms and Data Structures I Dr. Mary-Angela Papalaskari Department of Computing Sciences Villanova University Course website: www.csc.villanova.edu/~map/1051/

More information

Full file at

Full file at Java Programming, Fifth Edition 2-1 Chapter 2 Using Data within a Program At a Glance Instructor s Manual Table of Contents Overview Objectives Teaching Tips Quick Quizzes Class Discussion Topics Additional

More information

1001ICT Introduction To Programming Lecture Notes

1001ICT Introduction To Programming Lecture Notes 1001ICT Introduction To Programming Lecture Notes School of Information and Communication Technology Griffith University Semester 1, 2015 1 M Environment console M.1 Purpose This environment supports programming

More information

COMP-202 Unit 2: Java Basics. CONTENTS: Using Expressions and Variables Types Strings

COMP-202 Unit 2: Java Basics. CONTENTS: Using Expressions and Variables Types Strings COMP-202 Unit 2: Java Basics CONTENTS: Using Expressions and Variables Types Strings Assignment 1 Assignment 1 posted on WebCt. It will be due January 21 st at 13:00 Worth 4% Last Class Input and Output

More information

Zheng-Liang Lu Java Programming 45 / 79

Zheng-Liang Lu Java Programming 45 / 79 1 class Lecture2 { 2 3 "Elementray Programming" 4 5 } 6 7 / References 8 [1] Ch. 2 in YDL 9 [2] Ch. 2 and 3 in Sharan 10 [3] Ch. 2 in HS 11 / Zheng-Liang Lu Java Programming 45 / 79 Example Given a radius

More information

Mobile Computing Professor Pushpendra Singh Indraprastha Institute of Information Technology Delhi Java Basics Lecture 02

Mobile Computing Professor Pushpendra Singh Indraprastha Institute of Information Technology Delhi Java Basics Lecture 02 Mobile Computing Professor Pushpendra Singh Indraprastha Institute of Information Technology Delhi Java Basics Lecture 02 Hello, in this lecture we will learn about some fundamentals concepts of java.

More information

COMP-202: Foundations of Programming. Lecture 2: Variables, and Data Types Sandeep Manjanna, Summer 2015

COMP-202: Foundations of Programming. Lecture 2: Variables, and Data Types Sandeep Manjanna, Summer 2015 COMP-202: Foundations of Programming Lecture 2: Variables, and Data Types Sandeep Manjanna, Summer 2015 Announcements Midterm Exams on 4 th of June (12:35 14:35) Room allocation will be announced soon

More information

Computational Expression

Computational Expression Computational Expression Variables, Primitive Data Types, Expressions Janyl Jumadinova 28-30 January, 2019 Janyl Jumadinova Computational Expression 28-30 January, 2019 1 / 17 Variables Variable is a name

More information

Section 2: Introduction to Java. Historical note

Section 2: Introduction to Java. Historical note The only way to learn a new programming language is by writing programs in it. - B. Kernighan & D. Ritchie Section 2: Introduction to Java Objectives: Data Types Characters and Strings Operators and Precedence

More information

Chapter 4 Fundamental Data Types. Big Java by Cay Horstmann Copyright 2009 by John Wiley & Sons. All rights reserved.

Chapter 4 Fundamental Data Types. Big Java by Cay Horstmann Copyright 2009 by John Wiley & Sons. All rights reserved. Chapter 4 Fundamental Data Types ICOM 4015: Advanced Programming Lecture 4 Reading: Chapter Four: Fundamental Data Types Big Java by Cay Horstmann Copyright 2009 by John Wiley & Sons. All rights reserved.

More information

Primitive Data, Variables, and Expressions; Simple Conditional Execution

Primitive Data, Variables, and Expressions; Simple Conditional Execution Unit 2, Part 1 Primitive Data, Variables, and Expressions; Simple Conditional Execution Computer Science S-111 Harvard University David G. Sullivan, Ph.D. Overview of the Programming Process Analysis/Specification

More information

Introduction to Java & Fundamental Data Types

Introduction to Java & Fundamental Data Types Introduction to Java & Fundamental Data Types LECTURER: ATHENA TOUMBOURI How to Create a New Java Project in Eclipse Eclipse is one of the most popular development environments for Java, as it contains

More information

Computer Components. Software{ User Programs. Operating System. Hardware

Computer Components. Software{ User Programs. Operating System. Hardware Computer Components Software{ User Programs Operating System Hardware What are Programs? Programs provide instructions for computers Similar to giving directions to a person who is trying to get from point

More information

Primitive Data Types: Intro

Primitive Data Types: Intro Primitive Data Types: Intro Primitive data types represent single values and are built into a language Java primitive numeric data types: 1. Integral types (a) byte (b) int (c) short (d) long 2. Real types

More information

School of Computer Science CPS109 Course Notes 5 Alexander Ferworn Updated Fall 15

School of Computer Science CPS109 Course Notes 5 Alexander Ferworn Updated Fall 15 Table of Contents 1 INTRODUCTION... 1 2 IF... 1 2.1 BOOLEAN EXPRESSIONS... 3 2.2 BLOCKS... 3 2.3 IF-ELSE... 4 2.4 NESTING... 5 3 SWITCH (SOMETIMES KNOWN AS CASE )... 6 3.1 A BIT ABOUT BREAK... 7 4 CONDITIONAL

More information

Numerical Data. CS 180 Sunil Prabhakar Department of Computer Science Purdue University

Numerical Data. CS 180 Sunil Prabhakar Department of Computer Science Purdue University Numerical Data CS 180 Sunil Prabhakar Department of Computer Science Purdue University Problem Write a program to compute the area and perimeter of a circle given its radius. Requires that we perform operations

More information

CS/IT 114 Introduction to Java, Part 1 FALL 2016 CLASS 10: OCT. 6TH INSTRUCTOR: JIAYIN WANG

CS/IT 114 Introduction to Java, Part 1 FALL 2016 CLASS 10: OCT. 6TH INSTRUCTOR: JIAYIN WANG CS/IT 114 Introduction to Java, Part 1 FALL 2016 CLASS 10: OCT. 6TH INSTRUCTOR: JIAYIN WANG 1 Notice Assignments Reading Assignment: Chapter 3: Introduction to Parameters and Objects The Class 10 Exercise

More information

COMP-202 Unit 2: Java Basics. CONTENTS: Using Expressions and Variables Types Strings Methods

COMP-202 Unit 2: Java Basics. CONTENTS: Using Expressions and Variables Types Strings Methods COMP-202 Unit 2: Java Basics CONTENTS: Using Expressions and Variables Types Strings Methods Assignment 1 Assignment 1 posted on WebCt and course website. It is due May 18th st at 23:30 Worth 6% Part programming,

More information

Expressions and Data Types CSC 121 Spring 2017 Howard Rosenthal

Expressions and Data Types CSC 121 Spring 2017 Howard Rosenthal Expressions and Data Types CSC 121 Spring 2017 Howard Rosenthal Lesson Goals Understand the basic constructs of a Java Program Understand how to use basic identifiers Understand simple Java data types

More information

Chapter 2 Using Data. Instructor s Manual Table of Contents. At a Glance. Overview. Objectives. Teaching Tips. Quick Quizzes. Class Discussion Topics

Chapter 2 Using Data. Instructor s Manual Table of Contents. At a Glance. Overview. Objectives. Teaching Tips. Quick Quizzes. Class Discussion Topics Java Programming, Sixth Edition 2-1 Chapter 2 Using Data At a Glance Instructor s Manual Table of Contents Overview Objectives Teaching Tips Quick Quizzes Class Discussion Topics Additional Projects Additional

More information

Pace University. Fundamental Concepts of CS121 1

Pace University. Fundamental Concepts of CS121 1 Pace University Fundamental Concepts of CS121 1 Dr. Lixin Tao http://csis.pace.edu/~lixin Computer Science Department Pace University October 12, 2005 This document complements my tutorial Introduction

More information

Lecture 6. Assignments. Summary - Variables. Summary Program Parts 1/29/18. Reading: 3.1, 3.2, 3.3, 3.4

Lecture 6. Assignments. Summary - Variables. Summary Program Parts 1/29/18. Reading: 3.1, 3.2, 3.3, 3.4 Assignments Lecture 6 Complete for Project 1 Reading: 3.1, 3.2, 3.3, 3.4 Summary Program Parts Summary - Variables Class Header (class name matches the file name prefix) Class Body Because this is a program,

More information

CSE 142 Su 04 Computer Programming 1 - Java. Objects

CSE 142 Su 04 Computer Programming 1 - Java. Objects Objects Objects have state and behavior. State is maintained in instance variables which live as long as the object does. Behavior is implemented in methods, which can be called by other objects to request

More information

COMP Computer Basics. Yi Hong May 13, 2015

COMP Computer Basics. Yi Hong May 13, 2015 COMP 110-001 Computer Basics Yi Hong May 13, 2015 Today Hardware and memory Programs and compiling Your first program 2 Before Programming Need to know basics of a computer Understand what your program

More information

Basic Computation. Chapter 2

Basic Computation. Chapter 2 Basic Computation Chapter 2 Outline Variables and Expressions The Class String Keyboard and Screen I/O Documentation and Style Variables Variables store data such as numbers and letters. Think of them

More information

Program Fundamentals

Program Fundamentals Program Fundamentals /* HelloWorld.java * The classic Hello, world! program */ class HelloWorld { public static void main (String[ ] args) { System.out.println( Hello, world! ); } } /* HelloWorld.java

More information

Week 2: Data and Output

Week 2: Data and Output CS 170 Java Programming 1 Week 2: Data and Output Learning to speak Java Types, Values and Variables Output Objects and Methods What s the Plan? Topic I: A little review IPO, hardware, software and Java

More information

Exam 1 Prep. Dr. Demetrios Glinos University of Central Florida. COP3330 Object Oriented Programming

Exam 1 Prep. Dr. Demetrios Glinos University of Central Florida. COP3330 Object Oriented Programming Exam 1 Prep Dr. Demetrios Glinos University of Central Florida COP3330 Object Oriented Programming Progress Exam 1 is a Timed Webcourses Quiz You can find it from the "Assignments" link on Webcourses choose

More information

DATA TYPES AND EXPRESSIONS

DATA TYPES AND EXPRESSIONS DATA TYPES AND EXPRESSIONS Outline Variables Naming Conventions Data Types Primitive Data Types Review: int, double New: boolean, char The String Class Type Conversion Expressions Assignment Mathematical

More information

COMP 202 Java in one week

COMP 202 Java in one week COMP 202 Java in one week... Continued CONTENTS: Return to material from previous lecture At-home programming exercises Please Do Ask Questions It's perfectly normal not to understand everything Most of

More information

FUNDAMENTAL DATA TYPES

FUNDAMENTAL DATA TYPES CHAPTER 2 FUNDAMENTAL DATA TYPES Copyright 2013 by John Wiley & Sons. All rights reserved. Slides by Donald W. Smith TechNeTrain.com Final Draft Oct. 15, 2011 Chapter Goals To declare and initialize variables

More information

CS112 Lecture: Primitive Types, Operators, Strings

CS112 Lecture: Primitive Types, Operators, Strings CS112 Lecture: Primitive Types, Operators, Strings Last revised 1/24/06 Objectives: 1. To explain the fundamental distinction between primitive types and reference types, and to introduce the Java primitive

More information

Chapter 2: Data and Expressions

Chapter 2: Data and Expressions Chapter 2: Data and Expressions CS 121 Department of Computer Science College of Engineering Boise State University August 21, 2017 Chapter 2: Data and Expressions CS 121 1 / 51 Chapter 1 Terminology Review

More information

COMP 202 Java in one week

COMP 202 Java in one week CONTENTS: Basics of Programming Variables and Assignment Data Types: int, float, (string) Example: Implementing a calculator COMP 202 Java in one week The Java Programming Language A programming language

More information

CS 152: Data Structures with Java Hello World with the IntelliJ IDE

CS 152: Data Structures with Java Hello World with the IntelliJ IDE CS 152: Data Structures with Java Hello World with the IntelliJ IDE Instructor: Joel Castellanos e-mail: joel.unm.edu Web: http://cs.unm.edu/~joel/ Office: Electrical and Computer Engineering building

More information

COMP-202: Foundations of Programming

COMP-202: Foundations of Programming COMP-202: Foundations of Programming Lecture 3: Basic data types Jackie Cheung, Winter 2016 Review: Hello World public class HelloWorld { } public static void main(string[] args) { } System.out.println("Hello,

More information

Key Concept: all programs can be broken down to a combination of one of the six instructions Assignment Statements can create variables to represent

Key Concept: all programs can be broken down to a combination of one of the six instructions Assignment Statements can create variables to represent Programming 2 Key Concept: all programs can be broken down to a combination of one of the six instructions Assignment Statements can create variables to represent information Input can receive information

More information

Introduction to Computer Science Unit 2. Notes

Introduction to Computer Science Unit 2. Notes Introduction to Computer Science Unit 2. Notes Name: Objectives: By the completion of this packet, students should be able to describe the difference between.java and.class files and the JVM. create and

More information

Data and Variables. Data Types Expressions. String Concatenation Variables Declaration Assignment Shorthand operators. Operators Precedence

Data and Variables. Data Types Expressions. String Concatenation Variables Declaration Assignment Shorthand operators. Operators Precedence Data and Variables Data Types Expressions Operators Precedence String Concatenation Variables Declaration Assignment Shorthand operators Review class All code in a java file is written in a class public

More information

Lecture 6. Assignments. Java Scanner. User Input 1/29/18. Reading: 2.12, 2.13, 3.1, 3.2, 3.3, 3.4

Lecture 6. Assignments. Java Scanner. User Input 1/29/18. Reading: 2.12, 2.13, 3.1, 3.2, 3.3, 3.4 Assignments Reading: 2.12, 2.13, 3.1, 3.2, 3.3, 3.4 Lecture 6 Complete for Lab 4, Project 1 Note: Slides 12 19 are summary slides for Chapter 2. They overview much of what we covered but are not complete.

More information

Visual C# Instructor s Manual Table of Contents

Visual C# Instructor s Manual Table of Contents Visual C# 2005 2-1 Chapter 2 Using Data At a Glance Instructor s Manual Table of Contents Overview Objectives s Quick Quizzes Class Discussion Topics Additional Projects Additional Resources Key Terms

More information

Intro to Programming. Unit 7. What is Programming? What is Programming? Intro to Programming

Intro to Programming. Unit 7. What is Programming? What is Programming? Intro to Programming Intro to Programming Unit 7 Intro to Programming 1 What is Programming? 1. Programming Languages 2. Markup vs. Programming 1. Introduction 2. Print Statement 3. Strings 4. Types and Values 5. Math Externals

More information

CS 11 java track: lecture 1

CS 11 java track: lecture 1 CS 11 java track: lecture 1 Administrivia need a CS cluster account http://www.cs.caltech.edu/ cgi-bin/sysadmin/account_request.cgi need to know UNIX www.its.caltech.edu/its/facilities/labsclusters/ unix/unixtutorial.shtml

More information

Introduction to Java Applications

Introduction to Java Applications 2 Introduction to Java Applications OBJECTIVES In this chapter you will learn: To write simple Java applications. To use input and output statements. Java s primitive types. Basic memory concepts. To use

More information

Java Classes: Math, Integer A C S L E C T U R E 8

Java Classes: Math, Integer A C S L E C T U R E 8 Java Classes: Math, Integer A C S - 1903 L E C T U R E 8 Math class Math class is a utility class You cannot create an instance of Math All references to constants and methods will use the prefix Math.

More information

Variables and data types

Variables and data types Survivor: CSCI 135 Variables Variables and data types Stores information your program needs Each has a unique name Each has a specific type Java built-in type what it stores example values operations String

More information