// demonstrates call-by-reference parameters.
// Walt Savitch
// 10/3/00

#include <iostream>

using std::cout; using std::endl; using std::cin;

void getNumbers(int&, int&); // reads two integers from the keyboard.
void swap(int&, int&); // interchanges first and second parameter.
void showResults(int, int); // outputs parameters


int main(){
    int firstNum, secondNum;

    getNumbers(firstNum, secondNum);
    swap(firstNum, secondNum);
    showResults(firstNum, secondNum);
}

// reads two integers from user
void getNumbers(int& in1, int& in2) {
    cout << "Enter two integers: ";
    cin >> in1 >> in2;
}

// interchanges left and right
void swap(int& left, int& right) {
    const int tmp = left;
    left = right;
    right = tmp;
}

// outputs parameters
void showResults(int out1, int out2) {
    cout << "In reverse order, the numbers are: "
         << out1 << " " << out2 << endl;
}