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

int* incrementPtr(int* x) {
    if (x == nullptr) {
        return x;  // return null
    }
    else {
        (*x)++;        // increment the pointed-to value
        return x;      // return same pointer
    }

}

int incrementRef(int& x) {
    x++;
    return 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;
}

Solving Approach