/*
    testfunc12.cpp
    CIS 150
    2008-06-10
    David Klick
   
    Passing arguments by reference.
*/

#include <iostream>
using std::cin;
using std::cout;

void getDimensions(double &height, double &width);
void cont();

int main(int argc, char* argv[]) {
    double h, w;   // height and width

    cout << "Rectangle area calculator\n";
    getDimensions(h, w);
    cout << "The area is " << (h*w) << '\n';
   
    cont();
    return 0;
}

/*
    void getDimensions(double &height, double &width);
   
    Arguments:
        double &height: a ref var where the height will be stored
        double &width: a ref var where the width will be stored
   
    Returns: nothing (but note that the height and width entered
        by the user are stored in the reference variables passed
        in as arguments
   
    Gets height and width from user.
*/
void getDimensions(double &height, double &width) {
    // get height
    do {
        cout << "Enter height: ";
        cin >> height;
        if (height < 0.0) cout << "Error: height must be positive\n";
    } while (height < 0.0);
   
    // get width
    do {
        cout << "Enter width: ";
        cin >> width;
        if (width < 0.0) cout << "Error: width must be positive\n";
    } while (width < 0.0);
}

/*
    void cont();
   
    Arguments: none
   
    Returns: nothing
   
    Clears input buffer and pauses waiting for user 
    to press Enter.
*/
void cont() {
    if (cin.rdbuf()->sungetc() != -1 && cin.get() != '\n') cin.ignore(80,'\n');
    cout << "Press enter to continue...";
    cin.get();
}