Write a C program Using user-defined function for addition of N numbers.

Write a C program Using user-defined function for addition of N numbers.
Program:-
#include <stdio.h>
int addNumbers(int n);
int main()
{
    int num;
    printf("Enter a positive integer: ");
    scanf("%d", &num);
    printf("Sum = %d",add(num));
    return 0;
}
int add(int n)
{
    if(n != 0)
        return n + add(n-1);
    else
        return n;
}

Output:-