Pointer Reference Increment

#include <iostream>

// Define incrementPtr(int* x)
// Increment the value pointed to by x
// Do nothing if x is nullptr
void incrementPtr(int *x){
    if(x!=nullptr){
        (*x)++;
    }
}

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

-when passing by pointer, its value is directly incremented

-while passing by reference, x becomes bind to b. chnages made to x is reflected on b