Recursive factorial without if :-?

fact.cpp

#include <iostream>

bool fact(int n, int* res) {
    *res *= n;

    return n-1 && fact(n-1, res);
}

int main() {
    int i;
    
    for (int j = 1; i = 1, j < 6; j++) {
        fact(j, &i);
        std::cout << "fact(" << j << ") = " << i << std::endl;
    }

    return 0;
}

yasna@freedom:~/www/test/go/fact 
$ ./a.out     
fact(1) = 1
fact(2) = 2
fact(3) = 6
fact(4) = 24
fact(5) = 120

😄