Overload Resolution Trap

#include <iostream>
using namespace std;

// define void foo(int x) -> prints "int overload"
void foo(int x){
    printf("int overload\n");
}
// define void foo(int* p) -> prints "int* overload"
void foo(int* p){
    printf("int* overload\n");
}
int main() {
    foo(0);         
    foo(nullptr);   
    return 0;
}

Solving Approach