Pointer Reference Increment

#include <iostream>

// Define incrementPtr(int* x)
// Increment the value pointed to by x
// Do nothing if x is nullptr

// Define incrementRef(int& x)
// Increment the referenced value

void incrementPtr(int* x) {
    // std::cout << "Increment Pointer: " << *x << std::endl;

    if (x == nullptr) return;

    *x += 1;
}

void incrementRef(int& x) {
    // std::cout << "Increment Ref: " << x << std::endl;

    x++;
}

int main() {
    int n;
    std::cin >> n;

    int a{n};
    incrementPtr(&a);
    std::cout << "After incrementPtr: " << a << "\n";

    int b{n};
    incrementRef(b);
    std::cout << "After incrementRef: " << b;

    return 0;
}