// refs.cpp - in-class demo about reference parameters
// cmc, 10/29/2015

#include <iostream>
using namespace std;

// x is passed by value to function value
void value(int x) {
    x = 7;
}

// x is passed by reference to function ref
void ref(int &x) {
    x = 17;
}

int main() {
    int a = 1, b = 5;
    cout << "a = " << a << ", b = " << b << endl;
    value(a);  // value function does NOT change a
    ref(b); // ref function DOES change b
    cout << "a = " << a << ", b = " << b << endl;
    return 0;
}