#include <stdio.h>

int factorial( int N ) {
    printf( "in factorial, &N is %p\n", &N );
    if (N == 0) return 1;
    return N * factorial(N - 1);
}

int main() {
    int N = 5;
    printf( "in main, &N is %p\n", &N );
    N = factorial( N );
    printf( "N! is %d\n", N );
}