C language HelloWorld template

C language HelloWorld template

Before the first to write a C language program you first need to understand some basic knowledge of the C language.

Basics

First, a comment

1, line comments

//

2, block comment

/*
*/

Second, the header file

1, the operation import library

// import library operating the include 
// import a file stdio.h (std is a standard library, i is input, o is output, .h file header. Stdio library)
 // <> indicates the file into the system, "" represents import a customization file 
#include <stdio.h>

Third, function

1, function

// int data type, integer, if there is the return value represents a function in the function
 // main function man program, the program is only one primary function, () a parameter indicative of which parameters can be a function of a plurality of functions, intermediate separated by commas
 // {} function body, the body of code, the program body
 // ; end of each statement 
int main () {};

Write a HelloWorld

Features:

1, print hello word!

#include <stdio.h>

int main()
{
    printf("hello word!");
    return 0;
}

analysis:

#include <stdio.h> 

int main () 
{ 
    // the printf function from stdio.h system is provided showing the standard print on the output device, "" a string of 
    the printf ( " Hello World! " ); 

    / / return If the end of the other functions shown in the function, if present in the main function end programs
     // the return value of 0 represents a function, the function to return the value corresponding to the type and 
    return  0 ; 
}