Summation of Number by Recursion

#include<stdio.h>

int summation(int x)

{

    if(x == 0)

        return 0;

    else

        return x + summation(x-1);

}

int main()

{

    int n, sum;

    printf("Enter any positive number : ");

    scanf("%d", &n);

    sum = summation(n);

    printf("Summation is : %d\n", sum);

    return 0;

}