53. Double Pointer

#include <stdio.h>

void reassign_based_on_value(int **pp, int *n2_ptr) {
    **pp = ((**pp) % 2) ? **pp : *n2_ptr; 
}

int main() {
    int n1, n2;
    scanf("%d %d", &n1, &n2);

    int *p = &n1;

    reassign_based_on_value(&p, &n2);

    printf("%d", *p);

    return 0;
}