# } Evaluate the following expressions: 1. int x = 5 / 2 + 2; 2. int x = / 2; 3. int x = 5 / ; 4. double x = 5 / 2.

Size: px
Start display at page:

Download "} Evaluate the following expressions: 1. int x = 5 / 2 + 2; 2. int x = / 2; 3. int x = 5 / ; 4. double x = 5 / 2."

Transcription

1 Class #10: Understanding Primitives and Assignments Software Design I (CS 120): M. Allen, 19 Sep. 18 Java Arithmetic } Evaluate the following expressions: 1. int x = 5 / 2 + 2; 2. int x = / 2; 3. int x = 5 / ;. double x = 5 / ; 5. int x = (int) 5 / ; 6. int x = (int) ( 5 / ); 7. int x = 5 / (int) ; 8. int x = 5 / (int) ( ); 9. double x = 5 / 2 + 2; ERROR.5 ERROR 1.0 Wednesday, 19 Sep Software Design I (CS 120) 2 Java Mixed-Type Arithmetic: Tricky Cases } When we mix types of numbers in a math expression, the final result will be of widest type (unless we cast) } However, the result we get can also depend upon when the switch is made from narrow types to wider ones } This depends upon operator precedence, too } Examples: 1. 5 / 2 * / 2 * / 2.0 * 2. 5 / 2 * Here, since division 5 / 2 is performed first, and both 5 and 2 are of type int, we use int division Conversion to double type doesn t happen until the multiplication (*) Wednesday, 19 Sep Software Design I (CS 120) 3 } Remember: the assignment operator (=) is not the same as the equals sign used in mathematics } An assignment instruction in Java: is a command, saying that we should store the value of the expression to the target } If the target is a variable identifier, then we can change the value of what it stores this way Wednesday, 19 Sep Software Design I (CS 120) 1

2 } An assignment command in Java: is processed in a fixed order: 1. Evaluate expression, and compute its value, v 2. Assign value v to target } Since this is how the computer will process the command, we must do the very same when trying to understand what it will actually do } An assignment command in Java: is processed in a fixed order: 1. Evaluate expression, and compute its value, v 2. When finished, then assign value v to target } As an example, consider the command: double num = 5 / 2; which is processed as follows: 1. Evaluate expression 5 / 2: since the values are both integers, the arithmetic uses integer division, and computes the value 2 (and not 2.5) 2. Assign value 2 to num when complete, which saves result as a double } As a result, when this is complete, num is equal to 2.0 Wednesday, 19 Sep Software Design I (CS 120) 5 Wednesday, 19 Sep Software Design I (CS 120) 6 } Because of the right-hand, then left-hand order that Java does things, it is possible to have the same variable occur on both sides of the = operator } In normal arithmetic, this rarely happens, as something like the following is essentially meaningless, since there is no number n for which it is true that: n = n + 3 } In Java, however, such an expression is perfectly OK, as in the following: Keeping Track of Assignments } When processing Java code (and writing it), you need to make sure to work line by line, instruction by instruction int n1 = 6 + * 2; n1: 1 int n = 7; n = n + 3; [A] Set value of n to 7 int n2 = 7 / 2; n1 = n1 + n2; n2: 3 n1: [C] Finally, do left-hand (assignment) step. When the code is complete, the value of n is now 10 [B] Do the right-hand (evaluation) step, calculating: n n2 = n1 + n2; n2: Note that the 3rd line changes what n1 is. Thus, when we get to the th line, we use the new value of n1 to calculate n2. Wednesday, 19 Sep Software Design I (CS 120) 7 Wednesday, 19 Sep Software Design I (CS 120) 8 2

3 Shortcut Assignment Operators for Integers } Along with the basic arithmetic and assignment operators, int and double arithmetic can use some shortcuts to simplify our coding } Each of these does some arithmetic operation, and then does the assignment of the newly computed value to the associated identifier Shortcut Assignments Description Notation Example Equivalent* Subtract and assign -= x -= 3; x = x - 3; Add and assign += x += 3; x = x + 3; Multiply and assign *= x *= 3; x = x * 3; Divide and assign /= x /= 3; x = x / 3; Remainder and assign %= x %= 3; x = x % 3; Add one and assign ++ x++; x = x + 1; Subtract one and assign -- x--; x = x - 1; Using Shortcut Assignments int x = 10; x++; 11 x += 1; 12 x *= 2; 2 x -= 1; 23 x--; 22 x /= 5; (* See slides for more detail.) Wednesday, 19 Sep Software Design I (CS 120) 9 Wednesday, 19 Sep Software Design I (CS 120) 10 One Complication: Mixed Arithmetic } When dealing with a single type, it is OK to think of these complex assignment operators as simply abbreviations (as in the table on slide 9) } However, these operators actually have a cast operation built into them } Each time we run one, it does its computation and then casts the result to guarantee it is the right type } That is, cast will be to the type of the identifier on the left-hand side } Thus, when we see something like this: x *= 2; } This is really an abbreviation for: Here, the cast makes no difference to the result, but it is still technically performed. x = (int)( x * 2 ); // produces value 6 One Complication: Mixed Arithmetic } Due to the built-in cast operation for each complex assignment operator, we can mix types when using them } Just need to remember that the cast happens at the end, just before the assignment operation itself } Thus, something like this is completely legal in Java: int x = 2; x *=.5; } This is allowed, since it is actually an abbreviation for: int x = 2; x = (int)( x *.5 ); // produces value 9 Wednesday, 19 Sep Software Design I (CS 120) 11 Wednesday, 19 Sep Software Design I (CS 120) 12 3

4 } Basic Java code operations happen one by one, line by line, in the order given by the programmer } Until we actually reach some instruction, none of what it does is visible to our program } Thus, any variables we want to use have to be declared and instantiated before we use them } Assignments work like other sequential code } Once an assignment is given to some identifier, all uses of that identifier after that point will use the assigned value } Nothing before the assignment is affected } The newly assigned value is used until another assignment occurs } Example: what are the values of x and y after the following runs? Oval o = new Oval( 10, 10, size, size ); int size = 300; This code will not compile. The variable size must be declared and set to the value we want before we can use it in the Oval() constructor. y = 2; x is 5; y is 5 (x changed) x is 5; y is 2 (y changed) Wednesday, 19 Sep Software Design I (CS 120) 13 Wednesday, 19 Sep Software Design I (CS 120) 1 } Once an assignment is given to some identifier, all uses of that identifier after that point will use the assigned value } Nothing before the assignment is affected } The newly assigned value is used until another assignment occurs } Example: what are the values of x and y after the following runs? y = x; x is 5; y is 5 x is 5; y is 5 (no swap!) Wednesday, 19 Sep Software Design I (CS 120) 15 } Due to the sequential nature of Java, we sometimes have to get creative } As seen on the previous slide, if we want to swap two values, simply using two variable identifiers won t work } We need an extra variable to store temporary information if we are going to swap values of two variables int temp = x; y = temp; ; temp is 3 x is 5; y is 5; temp is 3 x is 5; y is 3; temp is 3 (swap!) Wednesday, 19 Sep Software Design I (CS 120) 16

5 This Week } Meetings this week: } Tuesday Thursday: regular classroom } Friday: in the CS Lab (16 Wing) } Homework 02: due Friday, 21 September, 5:00 PM on D2L } Reading assignment: End of chapter 3 ( ) } Next Tuesday, 25 September, by start of class } Quiz 02: Lectures 5 7 (to today) } Next Tuesday, 25 September, end of class } Office Hours: : Wing 210 } Monday/Wednesday/Friday, 12:00 PM 1:00 PM } Tuesday/Thursday, 1:30 PM 3:00 PM Wednesday, 19 Sep Software Design I (CS 120) 17 5

### Two Types of Types. Primitive Types in Java. Using Primitive Variables. Class #07: Java Primitives. Integer types.

Class #07: Java Primitives Software Design I (CS 120): M. Allen, 13 Sep. 2018 Two Types of Types So far, we have mainly been dealing with objects, like DrawingGizmo, Window, Triangle, that are: 1. Specified

### } Each object in a Java program has an identifier (name) } This includes:

Class #05: More about Objects and Methods Software Design I (CS 120): M. Allen, 11 Sept. 2018 Important Java Syntax I: Identifiers Each object in a Java program has an identifier (name) This includes:

### Review: Using Imported Code. What About the DrawingGizmo? Review: Classes and Object Instances. DrawingGizmo pencil; pencil = new DrawingGizmo();

Review: Using Imported Code Class #06: Objects, Memory, & Program Traces Software Engineering I (CS 120): M. Allen, 30 Jan. 2018 ; = new ();.setbackground( java.awt.color.blue );.setforeground( java.awt.color.yellow

### ENGINEERING 1020 Introduction to Computer Programming M A Y 2 6, R E Z A S H A H I D I

ENGINEERING 1020 Introduction to Computer Programming M A Y 2 6, 2 0 1 0 R E Z A S H A H I D I Today s class Constants Assignment statement Parameters and calling functions Expressions Mixed precision

### COMP-202: Foundations of Programming. Lecture 5: More About Methods and Data Types Jackie Cheung, Winter 2016

COMP-202: Foundations of Programming Lecture 5: More About Methods and Data Types Jackie Cheung, Winter 2016 More Tutoring Help The Engineering Peer Tutoring Services (EPTS) is hosting free tutoring sessions

### Expressions and Casting. Data Manipulation. Simple Program 11/5/2013

Expressions and Casting C# Programming Rob Miles Data Manipulation We know that programs use data storage (variables) to hold values and statements to process the data The statements are obeyed in sequence

### Searching for Information. A Simple Method for Searching. Simple Searching. Class #21: Searching/Sorting I

Class #21: Searching/Sorting I Software Design II (CS 220): M. Allen, 26 Feb. 18 Searching for Information Many applications involve finding pieces of information Finding a book in a library or store catalogue

### Expressions and Casting

Expressions and Casting C# Programming Rob Miles Data Manipulation We know that programs use data storage (variables) to hold values and statements to process the data The statements are obeyed in sequence

### Review: Classes and Object Instances. Review: Creating an Object. Using Multiple Objects. DrawingGizmo pencil; pencil = new DrawingGizmo();

Review: Classes and Object Instances ; = new (); Class #05: Objects, Memory, & Program Traces Software Engineering I (CS 120): M. Allen, 12/13 Sept. 17 We are working with both a class () and an object

### Review: Object Diagrams for Inheritance. Type Conformance. Inheritance Structures. Car. Vehicle. Truck. Vehicle. conforms to Object

Review: Diagrams for Inheritance - String makemodel - int mileage + (String, int) Class #3: Inheritance & Polymorphism Software Design II (CS 220): M. Allen, 25 Jan. 18 + (String, int) + void

### 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

### Using System.out.println()

Programming Assignments Read instructions carefully Many deduction on Program 3 for items in instructions Comment your code Coding conventions 20% of program grade going forward Class #23: Characters,

### Midterms Save the Dates!

University of British Columbia CPSC 111, Intro to Computation Alan J. Hu Primitive Data Types Arithmetic Operators Readings Your textbook is Big Java (3rd Ed). This Week s Reading: Ch 2.1-2.5, Ch 4.1-4.2.

### Basic Class Diagrams. Class Diagrams, cont d. Class Diagrams, cont d. Car. Car. Car. What does the minus sign here mean?

Class #02: Inheritance and Object-Oriented Design Software Design II (CS 220): M. Allen, 23 Jan. 18 Basic Class Diagrams Describes a class and how it can be used properly Sketch of properties and behaviors

### Midterms Save the Dates!

University of British Columbia CPSC 111, Intro to Computation Alan J. Hu Arithmetic Operators Type Conversion Constants Readings Your textbook is Big Java (3rd Ed). This Week s Reading: Ch 2.1-2.5, Ch

### Structures and Pointers

Structures and Pointers Comp-206 : Introduction to Software Systems Lecture 11 Alexandre Denault Computer Science McGill University Fall 2006 Note on Assignment 1 Please note that handin does not allow

### Slide 1 CS 170 Java Programming 1 Expressions Duration: 00:00:41 Advance mode: Auto

CS 170 Java Programming 1 Expressions Slide 1 CS 170 Java Programming 1 Expressions Duration: 00:00:41 What is an expression? Expression Vocabulary Any combination of operators and operands which, when

### 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,

### 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

### Information Science 1

Topics covered Information Science 1 Terms and concepts from Week 8 Simple calculations Documenting programs Simple Calcula,ons Expressions Arithmetic operators and arithmetic operator precedence Mixed-type

### CS Kangmei Yang. Page 1

CS 111 - Kangmei Yang Page 1 Variable Question: How do we know which type should we use for each variable? Answer: It depends on how we going to use the variable data. Page 2 Variable Type - int What can

### Module 2 - Part 2 DATA TYPES AND EXPRESSIONS 1/15/19 CSE 1321 MODULE 2 1

Module 2 - Part 2 DATA TYPES AND EXPRESSIONS 1/15/19 CSE 1321 MODULE 2 1 Topics 1. Expressions 2. Operator precedence 3. Shorthand operators 4. Data/Type Conversion 1/15/19 CSE 1321 MODULE 2 2 Expressions

### Converting Collections to Arrays. A Bad Approach to Array Conversion. A Better Approach to Array Conversion. public Object[] toarray();

Converting Collections to Arrays Every Java collection can be converted to an array This is part of the basic Collection interface The most elementary form of this method produces an array of base-type

### Slide 1 Side Effects Duration: 00:00:53 Advance mode: Auto

Side Effects The 5 numeric operators don't modify their operands Consider this example: int sum = num1 + num2; num1 and num2 are unchanged after this The variable sum is changed This change is called a

### Midterms Save the Dates!

University of British Columbia CPSC 111, Intro to Computation Alan J. Hu Arithmetic Operators Type Conversion Constants Readings Your textbook is Big Java (3rd Ed). This Week s Reading: Ch 2.1-2.5, Ch

### CS 221 Lecture. Tuesday, 13 September 2011

CS 221 Lecture Tuesday, 13 September 2011 Today s Agenda 1. Announcements 2. Boolean Expressions and logic 3. MATLAB Fundamentals 1. Announcements First in-class quiz: Tuesday 4 October Lab quiz: Thursday

### CS112 Lecture: Variables, Expressions, Computation, Constants, Numeric Input-Output

CS112 Lecture: Variables, Expressions, Computation, Constants, Numeric Input-Output Last revised January 12, 2006 Objectives: 1. To introduce arithmetic operators and expressions 2. To introduce variables

### Physics 2660: Fundamentals of Scientific Computing. Lecture 3 Instructor: Prof. Chris Neu

Physics 2660: Fundamentals of Scientific Computing Lecture 3 Instructor: Prof. Chris Neu (chris.neu@virginia.edu) Announcements Weekly readings will be assigned and available through the class wiki home

### 9/10/10. Arithmetic Operators. Today. Assigning floats to ints. Arithmetic Operators & Expressions. What do you think is the output?

Arithmetic Operators Section 2.15 & 3.2 p 60-63, 81-89 1 Today Arithmetic Operators & Expressions o Computation o Precedence o Associativity o Algebra vs C++ o Exponents 2 Assigning floats to ints int

### QUIZ. What is wrong with this code that uses default arguments?

QUIZ What is wrong with this code that uses default arguments? Solution The value of the default argument should be placed in either declaration or definition, not both! QUIZ What is wrong with this code

### VARIABLES. Aim Understanding how computer programs store values, and how they are accessed and used in computer programs.

Lesson 2 VARIABLES Aim Understanding how computer programs store values, and how they are accessed and used in computer programs. WHAT ARE VARIABLES? When you input data (i.e. information) into a computer

### Basic Data Types and Operators CS 8: Introduction to Computer Science, Winter 2019 Lecture #2

Basic Data Types and Operators CS 8: Introduction to Computer Science, Winter 2019 Lecture #2 Ziad Matni, Ph.D. Dept. of Computer Science, UCSB Your Instructor Your instructor: Ziad Matni, Ph.D(zee-ahd

### Computer Science II (20082) Week 1: Review and Inheritance

Computer Science II 4003-232-08 (20082) Week 1: Review and Inheritance Richard Zanibbi Rochester Institute of Technology Review of CS-I Syntax and Semantics of Formal (e.g. Programming) Languages Syntax

### EXPRESSIONS AND ASSIGNMENT CITS1001

EXPRESSIONS AND ASSIGNMENT CITS1001 Scope of this lecture Assignment statements Expressions ASSIGNMENT STATEMENT Assignment Statements!!!mark = 50;!! Read as the value in variable on the LHS becomes equal

### Robots. Byron Weber Becker. chapter 6

Using Variables Robots Learning to Program with Java Byron Weber Becker chapter 6 Announcements (Oct 3) Reminder: Reading for today y( (Oct 3 rd ) Ch 6.1-6.4 Reading for Wednesday (Oct 3 rd ) The rest

### SAMS Programming A/B. Lecture #1 Introductions July 3, Mark Stehlik

SAMS Programming A/B Lecture #1 Introductions July 3, 2017 Mark Stehlik Outline for Today Overview of Course A Python intro to be continued in lab on Wednesday (group A) and Thursday (group B) 7/3/2017

### CS313D: ADVANCED PROGRAMMING LANGUAGE

CS313D: ADVANCED PROGRAMMING LANGUAGE Computer Science department Lecture 2 : C# Language Basics Lecture Contents 2 The C# language First program Variables and constants Input/output Expressions and casting

### Organisation. Assessment

Week 1 s s Getting Started 1 3 4 5 - - Lecturer Dr Lectures Tuesday 1-13 Fulton House Lecture room Tuesday 15-16 Fulton House Lecture room Thursday 11-1 Fulton House Lecture room Friday 10-11 Glyndwr C

### Formatting & Style Examples

Formatting & Style Examples The code in the box on the right side is a program that shows an example of the desired formatting that is expected in this class. The boxes on the left side show variations

### CSC 120 Computer Science for the Sciences. Week 1 Lecture 2. UofT St. George January 11, 2016

CSC 120 Computer Science for the Sciences Week 1 Lecture 2 UofT St. George January 11, 2016 Introduction to Python & Foundations of computer Programming Variables, DataTypes, Arithmetic Expressions Functions

### Data Conversion & Scanner Class

Data Conversion & Scanner Class Quick review of last lecture August 29, 2007 ComS 207: Programming I (in Java) Iowa State University, FALL 2007 Instructor: Alexander Stoytchev Numeric Primitive Data Storing

### CS111: PROGRAMMING LANGUAGE II

1 CS111: PROGRAMMING LANGUAGE II Computer Science Department Lecture 1: Introduction Lecture Contents 2 Course info Why programming?? Why Java?? Write once, run anywhere!! Java basics Input/output Variables

### CS 135 Lab Assignments Week 1

CS 135 Lab Assignments Week 1 Professor: Matt B. Pedersen This handout is the assignment that you must finish for the lab portion of the course in week 1. You must finish the assignments yourself; if you

### 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

### Primitive Types. Four integer types: Two floating-point types: One character type: One boolean type: byte short int (most common) long

Primitive Types Four integer types: byte short int (most common) long Two floating-point types: float double (most common) One character type: char One boolean type: boolean 1 2 Primitive Types, cont.

### CT 229. Java Syntax 26/09/2006 CT229

CT 229 Java Syntax 26/09/2006 CT229 Lab Assignments Assignment Due Date: Oct 1 st Before submission make sure that the name of each.java file matches the name given in the assignment sheet!!!! Remember:

### 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

### Lecture Set 4: More About Methods and More About Operators

Lecture Set 4: More About Methods and More About Operators Methods Definitions Invocations More arithmetic operators Operator Side effects Operator Precedence Short-circuiting main method public static

### Information Science 1

Information Science 1 Simple Calcula,ons Week 09 College of Information Science and Engineering Ritsumeikan University Topics covered l Terms and concepts from Week 8 l Simple calculations Documenting

### VARIABLES AND TYPES CITS1001

VARIABLES AND TYPES CITS1001 Scope of this lecture Types in Java the eight primitive types the unlimited number of object types Values and References The Golden Rule Primitive types Every piece of data

### PIC 10A. Lecture 3: More About Variables, Arithmetic, Casting, Assignment

PIC 10A Lecture 3: More About Variables, Arithmetic, Casting, Assignment Assigning values to variables Our variables last time did not seem very variable. They always had the same value! Variables stores

### CIS 110: Introduction to Computer Programming

CIS 110: Introduction to Computer Programming Lecture 3 Express Yourself ( 2.1) 9/16/2011 CIS 110 (11fa) - University of Pennsylvania 1 Outline 1. Data representation and types 2. Expressions 9/16/2011

### CS112 Lecture: Working with Numbers

CS112 Lecture: Working with Numbers Last revised January 30, 2008 Objectives: 1. To introduce arithmetic operators and expressions 2. To expand on accessor methods 3. To expand on variables, declarations

### More on Arrays CS 16: Solving Problems with Computers I Lecture #13

More on Arrays CS 16: Solving Problems with Computers I Lecture #13 Ziad Matni Dept. of Computer Science, UCSB Announcements Homework #12 due today No homework assigned today!! Lab #7 is due on Monday,

### Announcements. 1. Forms to return today after class:

Announcements Handouts (3) to pick up 1. Forms to return today after class: Pretest (take during class later) Laptop information form (fill out during class later) Academic honesty form (must sign) 2.

### Chapter 2 Using Data. Instructor s Manual Table of Contents. At a Glance. A Guide to this Instructor s Manual:

Java Programming, Eighth Edition 2-1 Chapter 2 Using Data A Guide to this Instructor s Manual: We have designed this Instructor s Manual to supplement and enhance your teaching experience through classroom

### Introduction to Programming in C Department of Computer Science and Engineering. Lecture No. #23 Loops: Precedence of Operators

Introduction to Programming in C Department of Computer Science and Engineering Lecture No. #23 Loops: Precedence of Operators This one more concept that we have to understand, before we really understand

### Floating-point lab deadline moved until Wednesday Today: characters, strings, scanf Characters, strings, scanf questions clicker questions

Announcements Thursday Extras: CS Commons on Thursdays @ 4:00 pm but none next week No office hours next week Monday or Tuesday Reflections: when to use if/switch statements for/while statements Floating-point

### o Counter and sentinel controlled loops o Formatting output o Type casting o Top-down, stepwise refinement

Last Time Let s all Repeat Together 10/3/05 CS150 Introduction to Computer Science 1 1 We covered o Counter and sentinel controlled loops o Formatting output Today we will o Type casting o Top-down, stepwise

### Lab 7 1 Due Thu., 6 Apr. 2017

Lab 7 1 Due Thu., 6 Apr. 2017 CMPSC 112 Introduction to Computer Science II (Spring 2017) Prof. John Wenskovitch http://cs.allegheny.edu/~jwenskovitch/teaching/cmpsc112 Lab 7 - Using Stacks to Create a

### Lecture 2: Python Arithmetic

Lecture 2: Python Arithmetic CS1068+ Introductory Programming in Python Dr Kieran T. Herley 2018/19 Department of Computer Science University College Cork Basic data types in Python Python data types Programs

### CS113: Lecture 3. Topics: Variables. Data types. Arithmetic and Bitwise Operators. Order of Evaluation

CS113: Lecture 3 Topics: Variables Data types Arithmetic and Bitwise Operators Order of Evaluation 1 Variables Names of variables: Composed of letters, digits, and the underscore ( ) character. (NO spaces;

### CS 112 Introduction to Computing II. Wayne Snyder Computer Science Department Boston University

CS 112 Introduction to Computing II Wayne Snyder Department Boston University Today: Java basics: Compilation vs Interpretation Program structure Statements Values Variables Types Operators and Expressions

### 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

### Lecture 2: Variables & Assignments

http://www.cs.cornell.edu/courses/cs1110/2018sp Lecture 2: Variables & Assignments (Sections 2.1-2.3,2.5) CS 1110 Introduction to Computing Using Python [E. Andersen, A. Bracy, D. Gries, L. Lee, S. Marschner,

### Datatypes, Variables, and Operations

Datatypes, Variables, and Operations 1 Primitive Type Classification 2 Numerical Data Types Name Range Storage Size byte 2 7 to 2 7 1 (-128 to 127) 8-bit signed short 2 15 to 2 15 1 (-32768 to 32767) 16-bit

### 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

### I. Variables and Data Type week 3

I. Variables and Data Type week 3 variable: a named memory (i.e. RAM, which is volatile) location used to store/hold data, which can be changed during program execution in algebra: 3x + 5 = 20, x = 5,

### Lesson 3: Arithmetic & Casting. Pic 10A Ricardo Salazar

Lesson 3: Arithmetic & Casting Pic 10A Ricardo Salazar (2.4) Constants Sometimes we want a 'variable' that does not vary!? (OK that does not make sense... but how about a 'house' whose guest is always

### CS1 Lecture 3 Jan. 18, 2019

CS1 Lecture 3 Jan. 18, 2019 Office hours for Prof. Cremer and for TAs have been posted. Locations will change check class website regularly First homework assignment will be available Monday evening, due

### 1. Variables 2. Arithmetic 3. Input and output 4. Problem solving: first do it by hand 5. Strings 6. Chapter summary

Topic 2 1. Variables 2. Arithmetic 3. Input and output 4. Problem solving: first do it by hand 5. Strings 6. Chapter summary Arithmetic Operators C++ has the same arithmetic operators as a calculator:

### Slide 1 CS 170 Java Programming 1 Real Numbers Duration: 00:00:54 Advance mode: Auto

CS 170 Java Programming 1 Real Numbers Understanding Java's Floating Point Primitive Types Slide 1 CS 170 Java Programming 1 Real Numbers Duration: 00:00:54 Floating-point types Can hold a fractional amount

### Java enum, casts, and others (Select portions of Chapters 4 & 5)

Enum or enumerates types Java enum, casts, and others (Select portions of Chapters 4 & 5) Sharma Chakravarthy Information Technology Laboratory (IT Lab) Computer Science and Engineering Department The

### CS Programming I: Primitives and Expressions

CS 200 - Programming I: Primitives and Expressions Marc Renault Department of Computer Sciences University of Wisconsin Madison Spring 2018 TopHat Sec 3 (AM) Join Code: 427811 TopHat Sec 4 (PM) Join Code:

### 6.01, Spring Semester, 2008 Assignment 3, Issued: Tuesday, February 19 1

6.01, Spring Semester, 2008 Assignment 3, Issued: Tuesday, February 19 1 MASSACHVSETTS INSTITVTE OF TECHNOLOGY Department of Electrical Engineering and Computer Science 6.01 Introduction to EECS I Spring

### Values, Variables, Types & Arithmetic Expressions. Agenda

Values, Variables, Types & Arithmetic Expressions Lecture 2 Object-Oriented Programming Agenda Inside of a Computer Value Variable Data Types in Java Literals Identifiers Type conversions Manipulating

### 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

### Homework #3 CS2255 Fall 2012

Homework #3 CS2255 Fall 2012 MULTIPLE CHOICE 1. The, also known as the address operator, returns the memory address of a variable. a. asterisk ( * ) b. ampersand ( & ) c. percent sign (%) d. exclamation

### Lecture Set 4: More About Methods and More About Operators

Lecture Set 4: More About Methods and More About Operators Methods Definitions Invocations More arithmetic operators Operator Side effects Operator Precedence Short-circuiting main method public static

### Operational Semantics. One-Slide Summary. Lecture Outline

Operational Semantics #1 One-Slide Summary Operational semantics are a precise way of specifying how to evaluate a program. A formal semantics tells you what each expression means. Meaning depends on context:

### Lecture 4 CSE July 1992

Lecture 4 CSE 110 6 July 1992 1 More Operators C has many operators. Some of them, like +, are binary, which means that they require two operands, as in 4 + 5. Others are unary, which means they require

### CS103L FALL 2017 UNIT 1: TYPES, VARIABLES,EXPRESSIONS,C++ BASICS

CS103L FALL 2017 UNIT 1: TYPES, VARIABLES,EXPRESSIONS,C++ BASICS LOGISTICS Homework due tonight and Thursday Should be able to do after reading textbook - go to TA/CP office hours Do the lab Go to lab

### LECTURE 3 C++ Basics Part 2

LECTURE 3 C++ Basics Part 2 OVERVIEW Operators Type Conversions OPERATORS Operators are special built-in symbols that have functionality, and work on operands. Operators are actually functions that use

### Lecture 1. Course Overview Types & Expressions

Lecture 1 Course Overview Types & Expressions CS 1110 Spring 2012: Walker White Outcomes: Basics of (Java) procedural programming Usage of assignments, conditionals, and loops. Ability to write recursive

### CS107, Lecture 3 Bits and Bytes; Bitwise Operators

CS107, Lecture 3 Bits and Bytes; Bitwise Operators reading: Bryant & O Hallaron, Ch. 2.1 This document is copyright (C) Stanford Computer Science and Nick Troccoli, licensed under Creative Commons Attribution

### 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:

### 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

### Operators. Java Primer Operators-1 Scott MacKenzie = 2. (b) (a)

Operators Representing and storing primitive data types is, of course, essential for any computer language. But, so, too, is the ability to perform operations on data. Java supports a comprehensive set

### CISC-124. This week we continued to look at some aspects of Java and how they relate to building reliable software.

CISC-124 20180129 20180130 20180201 This week we continued to look at some aspects of Java and how they relate to building reliable software. Multi-Dimensional Arrays Like most languages, Java permits

### 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

### Control Flow. COMS W1007 Introduction to Computer Science. Christopher Conway 3 June 2003

Control Flow COMS W1007 Introduction to Computer Science Christopher Conway 3 June 2003 Overflow from Last Time: Why Types? Assembly code is typeless. You can take any 32 bits in memory, say this is an

### Variables and literals

Demo lecture slides Although I will not usually give slides for demo lectures, the first two demo lectures involve practice with things which you should really know from G51PRG Since I covered much of

### Will introduce various operators supported by C language Identify supported operations Present some of terms characterizing operators

Operators Overview Will introduce various operators supported by C language Identify supported operations Present some of terms characterizing operators Operands and Operators Mathematical or logical relationships

### cis20.1 design and implementation of software applications I fall 2007 lecture # I.2 topics: introduction to java, part 1

topics: introduction to java, part 1 cis20.1 design and implementation of software applications I fall 2007 lecture # I.2 cis20.1-fall2007-sklar-leci.2 1 Java. Java is an object-oriented language: it is

### QUIZ: Generations of computer technology. Hardware:

QUIZ: Generations of computer technology Hardware: 1. 2. 3. 4. 5. 1 QUIZ: Generations of computer technology Software: 1. 2. 3. 4. 5. 6. 2 Steampunk! 3 The Telectroscope, 1878-2008 Steampunk Wikipedia

### CS61C : Machine Structures

inst.eecs.berkeley.edu/~cs61c CS61C : Machine Structures Lecture 4 C Pointers 2004-09-08 Lecturer PSOE Dan Garcia www.cs.berkeley.edu/~ddgarcia Cal flies over Air Force We re ranked 13 th in the US and

### CS102: Variables and Expressions

CS102: Variables and Expressions The topic of variables is one of the most important in C or any other high-level programming language. We will start with a simple example: int x; printf("the value of

### CS11 Java. Fall Lecture 1

CS11 Java Fall 2006-2007 Lecture 1 Welcome! 8 Lectures Slides posted on CS11 website http://www.cs.caltech.edu/courses/cs11 7-8 Lab Assignments Made available on Mondays Due one week later Monday, 12 noon