c program to calculate first Numbers using recursion

Program to calculate first Numbers using recursion

Program

#include<stdio.h>

void main()

{

int sum(int);

int n;

printf("\nEnter Any Number : ");

scanf("%d", &n);

printf("\nSum of N values in the Series is : %d.", sum(n));

}

int sum(int x)

{

int a, b;

if(x == 0) return (0);

if(x == 1) return (1);

a = x - 1;

b = x + sum(a);

return(b);

}