Stream Model of I/O. Basic I/O in C
|
|
- Tamsin Freeman
- 5 years ago
- Views:
Transcription
1 Stream Model of I/O 1 A stream provides a connection between the process that initializes it and an object, such as a file, which may be viewed as a sequence of data. In the simplest view, a stream object is simply a serialized view of that other object. input file To be, or not to be? T o b e o r... That is the question. executing process We think of data as flowing in the stream to the process, which can remove data from the stream as desired. The data in the stream cannot be lost by flowing past before the program has a chance to remove it. header file: <stdio.h>
2 C FILE Type Accessing a stream requires a pointer of type FILE. 2 C provides three standard streams, which require no special preparation other than the necessary include directive: stdin standard input keyboard stdout standard output console window stderr standard error console window Alternatively, you can declare FILE pointers and manage their connections to disk files.
3 Output with printf() 3 The Standard Library provides the printf() function which can be used to write formatted output to the standard output stream, stdout. int printf(const char * restrict format,...); The first parameter is a string literal that specifies the formatting to be used. The remaining parameters, if any, specify the values to be written. The return value is the number of characters that were written, or a negative value if an error was encountered.
4 Output Examples The specification of format is mildly complex: 4 int i = 42, j = 17; double x = ; printf("i =%3d j =%3d\n", i, j); printf("x =%7.4f\n", x); i = 42 j = 17 x = There is an excellent discussion of the details in section 22.3 of the King book.
5 More on printf() Format Specifiers 5 The general form of a printf() specifier is: flags min width % # precision L length modifier conversion specifier g flags: optional, more than one allowed - left-justify within field + always show leading sign space precede non-negative numbers with a space # see reference 0 pad with zeros to fill field
6 More on printf() Format Specifiers 6 The general form of a printf() specifier is: flags min width % # precision L length modifier conversion specifier g min width: optional, pad with spaces if field not filled, ignored if insufficient precision: optional, number of digits for integer values, number of digits after decimal point for float/double
7 More on printf() Format Specifiers 7 The general form of a printf() specifier is: flags min width % # precision L length modifier conversion specifier g length modifier: optional, indicates value has a type that's longer or shorter than is normal for a particular conversion specifier (see following) d u hd ld normally used for int values normally used for unsigned int values normally used for short int values normally used for long int values see reference for more Table 22.5
8 More on printf() Format Specifiers 8 The general form of a printf() specifier is: flags min width % # precision L length modifier conversion specifier g conversion specifier: mandatory d, i converts int to decimal form f, F converts double to decimal form; default precison 6 c displays int as unsigned character see reference for more Table 22.6
9 Format Specifiers for <stdint.h> 9 The basic integer format codes will work with int32_t and uint32_t (with compiler warnings), but are not reliable with int64_t and uint64_t. The header file <inttypes.h> provides specialized format codes for the new integer types. Here's a very brief description; see King 27.2 for details. PRIdN for signed integer types, N = 8, 16, 32, 64 PRIuN for unsigned integer types For example: uint64_t K = ; printf("%15"priu64"\n", K); // note use of quotes!!
10 Input with scanf() 10 The Standard Library provides the scanf() function which can be used to write formatted output to the standard output stream, stdin. int scanf(const char * restrict format,...); The first parameter is a string literal that specifies the formatting expected in the input stream. The remaining parameters, if any, specify the variables that will receive the values that are read. The return value is the number of values that were read, or the value of EOF if an input failure occurs.
11 Input Examples 11 Suppose we have an input stream of the following form: int i = 1, j = 1; double x = 1.5; scanf("%d %d %f", &i, &j, &x); printf("%5d %5d %7.4f\n", i, j, x); Suppose we have an input stream of the following form: 17, 42, int i = 1, j = 1; double x = 1.5; scanf("%d, %d, %f", &i, &j, &x); printf("%5d %5d %7.4f\n", i, j, x);
12 More on scanf() Format Specifiers 12 The general form of a scanf() specifier is: % max width length modifier * 12 L g conversion specifier *: optional, read but do not assign value to an object max width: optional, leading whitespace doesn't count
13 More on scanf() Format Specifiers 13 The general form of a scanf() specifier is: % max width length modifier * 12 L g conversion specifier length modifier: optional, indicates object that will receive value has a type that's longer or shorter than is normal for a particular conversion specifier (see following) see reference for more Table conversion specifier: mandatory see reference for more Table 22.12
14 Opening Files 14 File I/O is almost identical to I/O with stdin and stdout. You must make a call in order to associate a FILE pointer with a particular file: FILE *fopen(const char* restrict filename, const char* restrict mode); filename mode path/name of file to be opened "r" "w" "a" "rb" "wb" "ab" "r+" "w+" "a+" see reference for more Return value is valid FILE pointer if successful and NULL otherwise.
15 File I/O 15 File I/O is accomplished using variations of printf() and scanf(): int fprintf(file * restrict stream, const char * restrict format,...); int fscanf(file * restrict stream, const char * restrict format,...); These are used in the same way as their counterparts, aside from taking a FILE*.
16 Closing Files 16 When done with a file, you should close the file: int fclose(file *stream); Any unwritten buffered data will be delivered to the host environment. Any unread buffered data will be discarded. Returns 0 on success and EOF otherwise.
C FILE Type. Basic I/O in C. Accessing a stream requires a pointer of type FILE.
C FILE Type Accessing a stream requires a pointer of type FILE. 1 C provides three standard streams, which require no special preparation other than the necessary include directive: stdin standard input
More informationC FILE Type. Basic I/O in C. Accessing a stream requires a pointer variable of type FILE.
C FILE Type Accessing a stream requires a pointer variable of type FILE. 1 C provides three standard streams, which require no special preparation other than the necessary include directive: stdin standard
More informationC Input/Output. Before we discuss I/O in C, let's review how C++ I/O works. int i; double x;
C Input/Output Before we discuss I/O in C, let's review how C++ I/O works. int i; double x; cin >> i; cin >> x; cout
More informationStandard File Pointers
1 Programming in C Standard File Pointers Assigned to console unless redirected Standard input = stdin Used by scan function Can be redirected: cmd < input-file Standard output = stdout Used by printf
More informationFile IO and command line input CSE 2451
File IO and command line input CSE 2451 File functions Open/Close files fopen() open a stream for a file fclose() closes a stream One character at a time: fgetc() similar to getchar() fputc() similar to
More informationFundamentals of Programming
Fundamentals of Programming Lecture 4 Input & Output Lecturer : Ebrahim Jahandar Borrowed from lecturer notes by Omid Jafarinezhad Outline printf scanf putchar getchar getch getche Input and Output in
More informationFundamental of Programming (C)
Borrowed from lecturer notes by Omid Jafarinezhad Fundamental of Programming (C) Lecturer: Vahid Khodabakhshi CE 43 - Fall 97 Lecture 4 Input and Output Department of Computer Engineering Outline printf
More informationProgramming in C. Session 8. Seema Sirpal Delhi University Computer Centre
Programming in C Session 8 Seema Sirpal Delhi University Computer Centre File I/O & Command Line Arguments An important part of any program is the ability to communicate with the world external to it.
More informationContent. Input Output Devices File access Function of File I/O Redirection Command-line arguments
File I/O Content Input Output Devices File access Function of File I/O Redirection Command-line arguments UNIX and C language C is a general-purpose, high-level language that was originally developed by
More informationCS102: Standard I/O. %<flag(s)><width><precision><size>conversion-code
CS102: Standard I/O Our next topic is standard input and standard output in C. The adjective "standard" when applied to "input" or "output" could be interpreted to mean "default". Typically, standard output
More informationSystem Software Experiment 1 Lecture 7
System Software Experiment 1 Lecture 7 spring 2018 Jinkyu Jeong ( jinkyu@skku.edu) Computer Systems Laboratory Sungyunkwan University http://csl.skku.edu SSE3032: System Software Experiment 1, Spring 2018
More informationChapter 5, Standard I/O. Not UNIX... C standard (library) Why? UNIX programmed in C stdio is very UNIX based
Chapter 5, Standard I/O Not UNIX... C standard (library) Why? UNIX programmed in C stdio is very UNIX based #include FILE *f; Standard files (FILE *varname) variable: stdin File Number: STDIN_FILENO
More informationCopyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Chapter 18 I/O in C Standard C Library I/O commands are not included as part of the C language. Instead, they are part of the Standard C Library. A collection of functions and macros that must be implemented
More informationFile I/O. Last updated 10/30/18
Last updated 10/30/18 Input/Output Streams Information flow between entities is done with streams Keyboard Text input stream data stdin Data Text output stream Monitor stdout stderr printf formats data
More informationITC213: STRUCTURED PROGRAMMING. Bhaskar Shrestha National College of Computer Studies Tribhuvan University
ITC213: STRUCTURED PROGRAMMING Bhaskar Shrestha National College of Computer Studies Tribhuvan University Lecture 07: Data Input and Output Readings: Chapter 4 Input /Output Operations A program needs
More informationInput/Output and the Operating Systems
Input/Output and the Operating Systems Fall 2015 Jinkyu Jeong (jinkyu@skku.edu) 1 I/O Functions Formatted I/O printf( ) and scanf( ) fprintf( ) and fscanf( ) sprintf( ) and sscanf( ) int printf(const char*
More informationC How to Program, 6/e by Pearson Education, Inc. All Rights Reserved.
C How to Program, 6/e 1992-2010 by Pearson Education, Inc. An important part of the solution to any problem is the presentation of the results. In this chapter, we discuss in depth the formatting features
More informationHIGH LEVEL FILE PROCESSING
HIGH LEVEL FILE PROCESSING 1. Overview The learning objectives of this lab session are: To understand the functions used for file processing at a higher level. o These functions use special structures
More informationThis code has a bug that allows a hacker to take control of its execution and run evilfunc().
Malicious Code Insertion Example This code has a bug that allows a hacker to take control of its execution and run evilfunc(). #include // obviously it is compiler dependent // but on my system
More informationShould you know scanf and printf?
C-LANGUAGE INPUT & OUTPUT C-Language Output with printf Input with scanf and gets_s and Defensive Programming Copyright 2016 Dan McElroy Should you know scanf and printf? scanf is only useful in the C-language,
More informationCMPT 102 Introduction to Scientific Computer Programming. Input and Output. Your first program
CMPT 102 Introduction to Scientific Computer Programming Input and Output Janice Regan, CMPT 102, Sept. 2006 0 Your first program /* My first C program */ /* make the computer print the string Hello world
More informationApplied Programming and Computer Science, DD2325/appcs15 PODF, Programmering och datalogi för fysiker, DA7011
Applied Programming and Computer Science, DD2325/appcs15 PODF, Programmering och datalogi för fysiker, DA7011 Autumn 2015 Lecture 3, Simple C programming M. Eriksson (with contributions from A. Maki and
More informationProgramming in C Quick Start! Biostatistics 615 Lecture 4
Programming in C Quick Start! Biostatistics 615 Lecture 4 Last Lecture Analysis of Algorithms Empirical Analysis Mathematical Analysis Big-Oh notation Today Basics of programming in C Syntax of C programs
More informationFile I/O. Arash Rafiey. November 7, 2017
November 7, 2017 Files File is a place on disk where a group of related data is stored. Files File is a place on disk where a group of related data is stored. C provides various functions to handle files
More informationC Concepts - I/O. Lecture 19 COP 3014 Fall November 29, 2017
C Concepts - I/O Lecture 19 COP 3014 Fall 2017 November 29, 2017 C vs. C++: Some important differences C has been around since around 1970 (or before) C++ was based on the C language While C is not actually
More informationArithmetic Expressions in C
Arithmetic Expressions in C Arithmetic Expressions consist of numeric literals, arithmetic operators, and numeric variables. They simplify to a single value, when evaluated. Here is an example of an arithmetic
More informationC Fundamentals & Formatted Input/Output. adopted from KNK C Programming : A Modern Approach
C Fundamentals & Formatted Input/Output adopted from KNK C Programming : A Modern Approach C Fundamentals 2 Program: Printing a Pun The file name doesn t matter, but the.c extension is often required.
More informationUnit 4. Input/Output Functions
Unit 4 Input/Output Functions Introduction to Input/Output Input refers to accepting data while output refers to presenting data. Normally the data is accepted from keyboard and is outputted onto the screen.
More informationUNIT-V CONSOLE I/O. This section examines in detail the console I/O functions.
UNIT-V Unit-5 File Streams Formatted I/O Preprocessor Directives Printf Scanf A file represents a sequence of bytes on the disk where a group of related data is stored. File is created for permanent storage
More informationBasic I/O. COSC Software Tools. Streams. Standard I/O. Standard I/O. Formatted Output
Basic I/O COSC2031 - Software Tools C - Input/Output (K+R Ch. 7) We know how to do some basic input and output: getchar - reading characters putchar - writing characters printf - formatted output Input
More informationOperators and Control Flow. CS449 Fall 2017
Operators and Control Flow CS449 Fall 2017 Running Example #include /* header file */ int main() { int grade, count, total, average; /* declaramons */ count = 0; /* inimalizamon */ total = 0;
More informationINTRODUCTION TO C++ C FORMATTED INPUT/OUTPUT. Dept. of Electronic Engineering, NCHU. Original slides are from
INTRODUCTION TO C++ C FORMATTED INPUT/OUTPUT Original slides are from http://sites.google.com/site/progntut/ Dept. of Electronic Engineering, NCHU Outline 2 printf and scanf Streams (input and output)
More informationInput / Output Functions
CSE 2421: Systems I Low-Level Programming and Computer Organization Input / Output Functions Presentation G Read/Study: Reek Chapter 15 Gojko Babić 10-03-2018 Input and Output Functions The stdio.h contain
More informationC for Engineers and Scientists: An Interpretive Approach. Chapter 14: File Processing
Chapter 14: File Processing Files and Streams C views each file simply as a sequential stream of bytes. It ends as if there is an end-of-file marker. The data structure FILE, defined in stdio.h, stores
More informationLecture 4. Console input/output operations. 1. I/O functions for characters 2. I/O functions for strings 3. I/O operations with data formatting
Lecture 4 Console input/output operations 1. I/O functions for characters 2. I/O functions for strings 3. I/O operations with data formatting Header files: stdio.h conio.h C input/output revolves around
More informationSlide Set 8. for ENCM 339 Fall 2017 Section 01. Steve Norman, PhD, PEng
Slide Set 8 for ENCM 339 Fall 2017 Section 01 Steve Norman, PhD, PEng Electrical & Computer Engineering Schulich School of Engineering University of Calgary October 2017 ENCM 339 Fall 2017 Section 01 Slide
More informationFile Handling in C. EECS 2031 Fall October 27, 2014
File Handling in C EECS 2031 Fall 2014 October 27, 2014 1 Reading from and writing to files in C l stdio.h contains several functions that allow us to read from and write to files l Their names typically
More informationLecture 7: Files. opening/closing files reading/writing strings reading/writing numbers (conversion to ASCII) command line arguments
Lecture 7: Files opening/closing files reading/writing strings reading/writing numbers (conversion to ASCII) command line arguments Lecture 5: Files, I/O 0IGXYVI*MPIW 0 opening/closing files reading/writing
More informationDATA STRUCTURES USING C
DATA STRUCTURES USING C File Handling in C Goals By the end of this unit you should understand how to open a file to write to it. how to open a file to read from it. how to open a file to append data to
More informationCourse organization. Course introduction ( Week 1)
Course organization Course introduction ( Week 1) Code editor: Emacs Part I: Introduction to C programming language (Week 2-9) Chapter 1: Overall Introduction (Week 1-3) Chapter 2: Types, operators and
More information25.2 Opening and Closing a File
Lecture 32 p.1 Faculty of Computer Science, Dalhousie University CSCI 2132 Software Development Lecture 32: Dynamically Allocated Arrays 26-Nov-2018 Location: Chemistry 125 Time: 12:35 13:25 Instructor:
More informationContinued from previous lecture
The Design of C: A Rational Reconstruction: Part 2 Jennifer Rexford Continued from previous lecture 2 Agenda Data Types Statements What kinds of operators should C have? Should handle typical operations
More informationReserved Words and Identifiers
1 Programming in C Reserved Words and Identifiers Reserved word Word that has a specific meaning in C Ex: int, return Identifier Word used to name and refer to a data element or object manipulated by the
More informationLecture 9: File Processing. Quazi Rahman
60-141 Lecture 9: File Processing Quazi Rahman 1 Outlines Files Data Hierarchy File Operations Types of File Accessing Files 2 FILES Storage of data in variables, arrays or in any other data structures,
More informationCS246 Spring14 Programming Paradigm Files, Pipes and Redirection
1 Files 1.1 File functions Opening Files : The function fopen opens a file and returns a FILE pointer. FILE *fopen( const char * filename, const char * mode ); The allowed modes for fopen are as follows
More informationBinghamton University. CS-220 Spring Includes & Streams
Includes & Streams 1 C Pre-Processor C Program Pre-Processor Pre-processed C Program Header Files Header Files 2 #include Two flavors: #include Replace this line with the contents of file abc.h
More informationTopic 6: A Quick Intro To C
Topic 6: A Quick Intro To C Assumption: All of you know Java. Much of C syntax is the same. Also: Many of you have used C or C++. Goal for this topic: you can write & run a simple C program basic functions
More informationC++ Input/Output: Streams
C++ Input/Output: Streams Basic I/O 1 The basic data type for I/O in C++ is the stream. C++ incorporates a complex hierarchy of stream types. The most basic stream types are the standard input/output streams:
More information1/25/2018. ECE 220: Computer Systems & Programming. Write Output Using printf. Use Backslash to Include Special ASCII Characters
University of Illinois at Urbana-Champaign Dept. of Electrical and Computer Engineering ECE 220: Computer Systems & Programming Review: Basic I/O in C Allowing Input from the Keyboard, Output to the Monitor
More informationCSC209H Lecture 3. Dan Zingaro. January 21, 2015
CSC209H Lecture 3 Dan Zingaro January 21, 2015 Streams (King 22.1) Stream: source of input or destination for output We access a stream through a file pointer (FILE *) Three streams are available without
More informationFundamentals of C. Structure of a C Program
Fundamentals of C Structure of a C Program 1 Our First Simple Program Comments - Different Modes 2 Comments - Rules Preprocessor Directives Preprocessor directives start with # e.g. #include copies a file
More informationFundamentals of Programming. Lecture 11: C Characters and Strings
1 Fundamentals of Programming Lecture 11: C Characters and Strings Instructor: Fatemeh Zamani f_zamani@ce.sharif.edu Sharif University of Technology Computer Engineering Department The lectures of this
More information2. Numbers In, Numbers Out
COMP1917: Computing 1 2. Numbers In, Numbers Out Reading: Moffat, Chapter 2. COMP1917 15s2 2. Numbers In, Numbers Out 1 The Art of Programming Think about the problem Write down a proposed solution Break
More informationCpSc 1111 Lab 4 Part a Flow Control, Branching, and Formatting
CpSc 1111 Lab 4 Part a Flow Control, Branching, and Formatting Your factors.c and multtable.c files are due by Wednesday, 11:59 pm, to be submitted on the SoC handin page at http://handin.cs.clemson.edu.
More informationTopic 8: I/O. Reading: Chapter 7 in Kernighan & Ritchie more details in Appendix B (optional) even more details in GNU C Library manual (optional)
Topic 8: I/O Reading: Chapter 7 in Kernighan & Ritchie more details in Appendix B (optional) even more details in GNU C Library manual (optional) No C language primitives for I/O; all done via function
More informationStandard I/O in C and C++
Introduction to Computer and Program Design Lesson 7 Standard I/O in C and C++ James C.C. Cheng Department of Computer Science National Chiao Tung University Standard I/O in C There three I/O memory buffers
More information2. Numbers In, Numbers Out
REGZ9280: Global Education Short Course - Engineering 2. Numbers In, Numbers Out Reading: Moffat, Chapter 2. REGZ9280 14s2 2. Numbers In, Numbers Out 1 The Art of Programming Think about the problem Write
More informationUNIT IV-2. The I/O library functions can be classified into two broad categories:
UNIT IV-2 6.0 INTRODUCTION Reading, processing and writing of data are the three essential functions of a computer program. Most programs take some data as input and display the processed data, often known
More informationCourse Outline Introduction to C-Programming
ECE3411 Fall 2015 Lecture 1a. Course Outline Introduction to C-Programming Marten van Dijk, Syed Kamran Haider Department of Electrical & Computer Engineering University of Connecticut Email: {vandijk,
More informationMode Meaning r Opens the file for reading. If the file doesn't exist, fopen() returns NULL.
Files Files enable permanent storage of information C performs all input and output, including disk files, by means of streams Stream oriented data files are divided into two categories Formatted data
More informationThe Design of C: A Rational Reconstruction: Part 2
The Design of C: A Rational Reconstruction: Part 2 1 Continued from previous lecture 2 Agenda Data Types Operators Statements I/O Facilities 3 Operators Issue: What kinds of operators should C have? Thought
More informationOutline. Computer Programming. Preprocessing in C. File inclusion. Preprocessing in C
Outline Computer Programming The greatest gift you can give another is the purity of your attention. Richard Moss Preprocessing in C Function vs macro Conditional compilation Constant identifiers Standard
More informationComputer Programming Unit v
READING AND WRITING CHARACTERS We can read and write a character on screen using printf() and scanf() function but this is not applicable in all situations. In C programming language some function are
More informationIntroduction to Computing Lecture 03: Basic input / output operations
Introduction to Computing Lecture 03: Basic input / output operations Assist.Prof.Dr. Nükhet ÖZBEK Ege University Department of Electrical & Electronics Engineering nukhet.ozbek@ege.edu.tr Topics Streams
More informationInput/Output: Advanced Concepts
Input/Output: Advanced Concepts CSE 130: Introduction to Programming in C Stony Brook University Related reading: Kelley/Pohl 1.9, 11.1 11.7 Output Formatting Review Recall that printf() employs a control
More informationInput/output functions
Computer Programming Input/output functions Marius Minea marius@cs.upt.ro 6 November 2017 All inputs must be checked! A program will not always receive the data it asks for User may make mistakes, or may
More informationLab Session # 1 Introduction to C Language. ALQUDS University Department of Computer Engineering
2013/2014 Programming Fundamentals for Engineers Lab Lab Session # 1 Introduction to C Language ALQUDS University Department of Computer Engineering Objective: Our objective for today s lab session is
More informationStandard C Library Functions
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
More informationFile Access. FILE * fopen(const char *name, const char * mode);
File Access, K&R 7.5 Dealing with named files is surprisingly similar to dealing with stdin and stdout. Start by declaring a "file pointer": FILE *fp; /* See Appendix B1.1, pg. 242 */ header
More informationHow do we define pointers? Memory allocation. Syntax. Notes. Pointers to variables. Pointers to structures. Pointers to functions. Notes.
, 1 / 33, Summer 2010 Department of Computer Science and Engineering York University Toronto June 15, 2010 Table of contents, 2 / 33 1 2 3 Exam, 4 / 33 You did well Standard input processing Testing Debugging
More informationCS 261 Fall C Introduction. Variables, Memory Model, Pointers, and Debugging. Mike Lam, Professor
CS 261 Fall 2017 Mike Lam, Professor C Introduction Variables, Memory Model, Pointers, and Debugging The C Language Systems language originally developed for Unix Imperative, compiled language with static
More informationC Introduction. Comparison w/ Java, Memory Model, and Pointers
CS 261 Fall 2018 Mike Lam, Professor C Introduction Comparison w/ Java, Memory Model, and Pointers Please go to socrative.com on your phone or laptop, choose student login and join room LAMJMU The C Language
More informationCpSc 1111 Lab 4 Formatting and Flow Control
CpSc 1111 Lab 4 Formatting and Flow Control Overview By the end of the lab, you will be able to: use fscanf() to accept a character input from the user and print out the ASCII decimal, octal, and hexadecimal
More informationFundamental of Programming (C)
Borrowed from lecturer notes by Omid Jafarinezhad Fundamental of Programming (C) Lecturer: Vahid Khodabakhshi Lecture 3 Constants, Variables, Data Types, And Operations Department of Computer Engineering
More informationQuick review of previous lecture Ch6 Structure Ch7 I/O. EECS2031 Software Tools. C - Structures, Unions, Enums & Typedef (K&R Ch.
1 Quick review of previous lecture Ch6 Structure Ch7 I/O EECS2031 Software Tools C - Structures, Unions, Enums & Typedef (K&R Ch.6) Structures Basics: Declaration and assignment Structures and functions
More informationsends the formatted data to the standard output stream (stdout) int printf ( format_string, argument_1, argument_2,... ) ;
INPUT AND OUTPUT IN C Function: printf() library: sends the formatted data to the standard output stream (stdout) int printf ( format_string, argument_1, argument_2,... ) ; format_string it is
More informationBasic Types and Formatted I/O
Basic Types and Formatted I/O C Variables Names (1) Variable Names Names may contain letters, digits and underscores The first character must be a letter or an underscore. the underscore can be used but
More informationPointer Casts and Data Accesses
C Programming Pointer Casts and Data Accesses For this assignment, you will implement a C function similar to printf(). While implementing the function you will encounter pointers, strings, and bit-wise
More informationThe C Programming Language Part 2. (with material from Dr. Bin Ren, William & Mary Computer Science)
The C Programming Language Part 2 (with material from Dr. Bin Ren, William & Mary Computer Science) 1 Overview Input/Output Structures and Arrays 2 Basic I/O character-based putchar (c) output getchar
More informationTopic 6: A Quick Intro To C. Reading. "goto Considered Harmful" History
Topic 6: A Quick Intro To C Reading Assumption: All of you know basic Java. Much of C syntax is the same. Also: Some of you have used C or C++. Goal for this topic: you can write & run a simple C program
More informationEngineering program development 7. Edited by Péter Vass
Engineering program development 7 Edited by Péter Vass Functions Function is a separate computational unit which has its own name (identifier). The objective of a function is solving a well-defined problem.
More informationIntroduction to Programming
Introduction to Programming Lecture 5: Interaction Interaction Produce output Get input values 2 Interaction Produce output Get input values 3 Printing Printing messages printf("this is message \n"); Printing
More informationSummer June 15, 2010
Summer 2010 Department of omputer Science and Engineering York University Toronto June 15, 2010 1 / 33 Table of contents 1 2 3 2 / 33 Plan 1 2 3 3 / 33 Exam summary You did well Standard input processing
More information(T) x. Casts. A cast converts the value held in variable x to type T
Several New Things 2 s complement representation of negative integers The data size flag in the conversion specification of printf Recast of &n to unsigned long to get the address 2 3 Casts (T) x A cast
More informationIntroduction to C. Systems Programming Concepts
Introduction to C Systems Programming Concepts Introduction to C A simple C Program Variable Declarations printf ( ) Compiling and Running a C Program Sizeof Program #include What is True in C? if example
More informationAN OVERVIEW OF C, PART 3. CSE 130: Introduction to Programming in C Stony Brook University
AN OVERVIEW OF C, PART 3 CSE 130: Introduction to Programming in C Stony Brook University FANCIER OUTPUT FORMATTING Recall that you can insert a text field width value into a printf() format specifier:
More informationprintf("%c\n", character); printf("%s\n", "This is a string"); printf("%s\n", string); printf("%s\n",stringptr); return 0;
Chapter 9: Formatted Input/Output ================================= * All input and output is performed with streams - sequences of characters organized into lines. * Each line consists of zero or more
More informationEL2310 Scientific Programming
Lecture 11: Memory, Files and Bitoperations (yaseminb@kth.se) Overview Overview Lecture 11: Memory, Files and Bit operations Main function; reading and writing Bitwise Operations Lecture 11: Memory, Files
More informationFormatted Input/Output
Chapter 3 Formatted Input/Output 1 The printf Function The printf function must be supplied with a format string ( 格式化字串 ), followed by any values that are to be inserted into the string during printing:
More informationC Language Part 1 Digital Computer Concept and Practice Copyright 2012 by Jaejin Lee
C Language Part 1 (Minor modifications by the instructor) References C for Python Programmers, by Carl Burch, 2011. http://www.toves.org/books/cpy/ The C Programming Language. 2nd ed., Kernighan, Brian,
More informationFiles. Programs and data are stored on disk in structures called files Examples. a.out binary file lab1.c - text file term-paper.
File IO part 2 Files Programs and data are stored on disk in structures called files Examples a.out binary file lab1.c - text file term-paper.doc - binary file Overview File Pointer (FILE *) Standard:
More informationGetting Started. Project 1
Getting Started Project 1 Project 1 Implement a shell interface that behaves similarly to a stripped down bash shell Due in 3 weeks September 21, 2015, 11:59:59pm Specification, grading sheet, and test
More informationPhysics 6720 I/O Methods October 30, C++ and Unix I/O Streams
Physics 6720 I/O Methods October 30, 2002 We have been using cin and cout to handle input from the keyboard and output to the screen. In these notes we discuss further useful capabilities of these standard
More informationCS240: Programming in C
CS240: Programming in C Lecture 13 si 14: Unix interface for working with files. Cristina Nita-Rotaru Lecture 13/Fall 2013 1 Working with Files (I/O) File system: specifies how the information is organized
More informationLibrary Functions. General Questions
1 Library Functions General Questions 1. What will the function rewind() do? A. Reposition the file pointer to a character reverse. B. Reposition the file pointer stream to end of file. C. Reposition the
More information// file2.c. // file1.c #include <stdio.h> int A1 = 42; // 1.1 static int B1; // 1.2. int A2 = 12; // 2.1 int B2; // 2.2. extern int A2; // 1.
Instructions: This homework assignment focuses primarily on issues arising when compiling and linking C programs that consist of multiple source files. The answers to the following questions can be determined
More informationIntroduction to Computer and Program Design. Lesson 6. File I/O. James C.C. Cheng Department of Computer Science National Chiao Tung University
Introduction to Computer and Program Design Lesson 6 File I/O James C.C. Cheng Department of Computer Science National Chiao Tung University File System in OS Microsoft Windows Filename DriveID : /DirctoryName/MainFileName.ExtensionName
More informationBİL200 TUTORIAL-EXERCISES Objective:
Objective: The purpose of this tutorial is learning the usage of -preprocessors -header files -printf(), scanf(), gets() functions -logic operators and conditional cases A preprocessor is a program that
More informationSimple Output and Input. see chapter 7
Simple Output and Input see chapter 7 Simple Output puts(), putc(), printf() Simple Output The simplest form of output is ASCII text. ASCII occurs as single characters, and as nullterminated text strings
More information