// 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 swapValues(int&, int&); // interchanges first and second parameter.
void showResults(int, int); // outputs parameters


int main(){
    int firstNum, secondNum;

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

// reads two integers from the keyboard.
void getNumbers(int& input1, int& input2) {
    cout << "Enter two integers: ";
    cin >> input1 >> input2;
}

// interchanges var1 and var2.
void swapValues(int& var1, int& var2) {
    int temp;

    temp = var1;
    var1 = var2;
    var2 = temp;
}

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