c program Addition of two number using function with comments

How to add two number using function in c language.
first include header files .
 This program is simple program in c language which is showing use of function to create in c  program and call that function for adding two numbers .in simple method we can do also but , by using function it makes easier .

#include<stdio.h> // header files

void main()    //start of main
{ //opening of main
  int first_number,second_number;      //declaration of two variable later which will store the values
  clrscr();
  printf("\n Enter 2 Number:"); //asking for enter the numbers
  scanf("%d %d",&first_number,&second_number);        //taking two numbers and storing  into variable first_number and second_number.
  printf("\Addition=%d",add(first_number,second_number));   calling function add()
}   //closing of main


  int add(int x,int y) //function add
  {
    return(x+y);   //will give addition of two numbers
  } // close function

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