Program for calculating sum of first 'n' number.

#include <stdio.h>
#include <conio.h>
void main()
{
int sum();
int n,ans ;
clrscr();
printf("\n\n\n\t\t Program for calculating sum of first 'n' number");
printf("\n\n\n\t\t\t Sum of how many numbers you want ? = ");
scanf("%d",&n);

ans=sum(n);
printf("\n\n\t\t\t Sum of first %d number(1 to %d) is %d",n,n,ans);

getch();
}

int sum(int n)
{
if(n==0)
return(0);
else
return(n+sum(n-1));

}