Double Pointer

Code

#include <stdio.h>
void reassign_based_on_value(int **pp, int *n2_ptr) 
{
    if((**pp)%2==0)
    {
        **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;
}

Solving Approach