//* Passing by pointer compared to passing by reference *
#include <iostream>
using namespace std;

void SwapBad(int a, int b) {
    int t;
    t = a;
    a = b;
    b = t;
}

void SwapRef(int &a, int &b) {
    int t;
    t = a;
    a = b;
    b = t;
}

void SwapPtr(int *a, int *b) {
    int t;
     t = *a;
    *a = *b;
    *b =  t;
}



int main() {
    int x, y, z;

    cout << "Please enter three values to start testing " << endl;
    cin >> x >> y >> z;
    cout <<"E:   "<<x<<" "<<y<<" "<<z<<endl;
    SwapBad(x,y);
    cout <<"SB1: "<<x<<" "<<y<<" "<<z<<endl;
    SwapBad(y,z);
    cout <<"SB2: "<<x<<" "<<y<<" "<<z<<endl;
    SwapRef(x,y);
    cout <<"SR1: "<<x<<" "<<y<<" "<<z<<endl;
    SwapRef(y,z);
    cout <<"SR2: "<<x<<" "<<y<<" "<<z<<endl;
    SwapPtr(&x,&y); // use & when * is used function-side!!!
    cout <<"SP1: "<<x<<" "<<y<<" "<<z<<endl;
    SwapPtr(&y,&z);
    cout <<"SP1: "<<x<<" "<<y<<" "<<z<<endl;


    return(0);
}