Basic structure of c program

Basically, every C program has two major sections.

Header section

Main section

Header Section (Why we use header files in c)

Example

stdio.h It will have all the information about i/o related functions definition.If our c program needs to say something to the user or get some input from the user, we should use printf and scanf function accordingly.

whenever we need to use input and output related (ex. printf/scanf) functions in our program, we should include stdio.h header file.

Likewise, math.h - will have all mathematical functions' definition.Using math.h header file we can calculate, the square root of a number,power(x,y) i.e. x^y etc.

Main section (Why main function is used in c)

Wherever the main function is, it will be called first.So main function is the heart of C program.

Example

#include<stdio.h>       //header section

int main()             //main section
{
    return 0;
}

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