Structure of c program

Structure of c program:-

By the structure , it means that any program can be written in this structure only . writing a c program in any other stucture will hence lead to a compilation error.

The structure of a c program is following:-

Explanation:-

(1) Header file:-

A header file is a file with extension.h , which contains C functions and macro definitions to be shared between several source files.

(Ex:- <stdio.h> , <conio.h> , <math.h> , <string.h>

(2) Main function :-

The main function is declared in c program by following syntax:-

int main()                 void main()
   {}             or           {}

(3) Variable declaration :-

it is mandatory to declare th variable type in c programs while using variable , without declaration th program will showing error while compilation.

Example:-

int main()
{
    int a;
.

(4) Body :-

The body of the c programs ,refers to the operations that are performed in the functions.It can be anything like searching ,sorting , printing etc.

int main()
{
    int a;

    printf("%d", a);
.
.

(5) Return statement :-

The last part of any c program is return statement . The return statements refers to the returning of the value from a function .

This return statement and return value depends upon return type of function .(If return type is void , then there will be no return statement . In other case , there will be a return value.

Example:-

int main()
{
    int a;

    printf("%d", a);

    return 0;
}

* Our first C program :-

#include <stdio.h>

int main(void)
{

    printf("Code with AD");

    return 0;
}

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Structure of c program