Dodawanie rekurencyjnie

#include <stdio.h>

int mn(int a, int b);

int main()
{
    int k, n, a, b;
    k = mn(6, 5);
    printf("%d", k);
    getch();
    return 0;
}

int mn(int a, int b)
{
    if (b == 0) return 0;
    else return a+mn(a, b-1);
}
//mn 5 = a+mn(5, 4) = 5+20
//mn 4 = a+mn(5, 3) = 5+15
//mn 3 = a+mn(5, 2) = 5+10
//mn 2 = a+mn(5, 1) = 5+5
//mn 1 = a+mn(5, 0) = 5+0