Pointer Reference Increment

#include <iostream>
void incrementPtr(int*x){
    if(x==nullptr) return ;
    *x=*x+1;
}
// Define incrementPtr(int* x)
// Increment the value pointed to by x
// Do nothing if x is nullptr
void incrementRef(int&x){
    x=x+1;
}
// Define incrementRef(int& x)
// Increment the referenced value

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