Program that defines a function to add first n numbers

				
					#include <stdio.h>

int getsum(int);

int main(void) {
  int n;
  printf("Enter Any number n = ");
  scanf("%d", & n);
  printf("\n SUM = %d", getsum(n));
  return 0;
}

int getsum(int n) {
  return ((n * (n + 1)) / 2);
}