Introduction to C Programming- Session2

Introduction to C Programming- Session2 - Introduction to C...

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Introduction to C Programming CS 049 Laboratory Nima Bari
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vi Pico Emacs Xcode MS visual studio gcc –c test.c gcc –o results test.c ./results
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A Simple C Program /* Filename: test.c Programmer: Nima Bari Date written: September 10 th , 2012 Description: This program prints the greeting “Hello, World!” */ #include <stdio.h> int main ( void ) { printf ( “Hello, World!\n” ) ; return 0 ; }
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/* program header comment */ preprocessor directives (if any) int main ( void ) { statement(s) return 0 ; }
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Comments Text surrounded by /* and */ is ignored by computer Used to describe program #include <stdio.h> Preprocessor directive Tells computer to load contents of a certain file <stdio.h> allows standard input/output operations int main() C programs contain one or more functions, exactly one of which must be main Parenthesis used to indicate a function int means that main "returns" an integer value Braces ( { and } ) indicate a block The bodies of all functions must be contained in braces
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printf( “Hello, World!\n" ); Instructs computer to perform an action Specifically, prints the string of characters within quotes ( ) Entire line called a statement All statements must end with a semicolon ( ; ) Escape character ( \ ) Indicates that printf should do something out of the ordinary \n is the newline character return 0; A way to exit a function return 0
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