gistfile1.c

#include <stdio.h>
void fact(int* n, int* out);

int main(int argc, char *argv[]) {
    int n = atoi(argv[1]);
    int out = 1;
    fact(&n, &out);
    printf("%d\n", out);

    return 0;
}

void fact(int* n, int* out) {
    int i;
    printf("fact kaldt; n = %d, out = %d\n", *n, *out);
    if ((*n) == 0) return;
    *out *= (*n)--;
    *(&i+4) -= 5;
}