ptrSwapTwoNum

#include <iostream>

int main()
{
    int a{42};
    int b{33};
    int tmp{};

    int* ptrA{&a};
    int* ptrB{&b};
    int* ptrTmp{&tmp};

    *ptrTmp = *ptrA;
    *ptrA = *ptrB;
    *ptrB = *ptrTmp;

    std::cout << "a = " << *ptrA << " b = " << *ptrB << '\n';

    return 0;
}