C Sum Of 2 (sample code)

/*C basic structure example
to find sum of two numbers */    //documentation section

#include<stdio.h>        //Link section

int total;            //Global declaration section
int sum(int,int);        //Function declaration section
void main()            //Main section
 {
  int a,b;
  printf("\n Enter the two numbers : ");
  scanf("%d  %d",&a,&b);    /* taking two numbers as input*/
  total = sum(a,b);      /* calling function.The value returned by the function is stored in total */
  printf("\n The sum of two numbers is : %d ",total);
  getch();
 }

 int sum ( int num1,int num2)    //User defined section
 {
  int result;          /* defining variable, its scope lies within function */
  result = num1 + num2 ;   /*adding two numbers*/
  return (result) ;        //definition section
 }