VendingMachine Class Source Code

VendingMachine Class, source code file VendingMachine.cs

/// <summary>          
/// Simulate a candy bar vending machine that starts with
/// 5 candy bars, where each candy bar costs 3 quarters.
/// </summary>

public class VendingMachine
{
    // private instance variables
    private int _numQuarters, _numCandyBars;

// Public noarg constructor
    public VendingMachine()
    {
        // Set the candy bar cost in quarters.  
        _numQuarters = 3;

// Set initial number of candy bars.
        _numCandyBars = 5;
    }

// Public read only properties:
 
    public int NumQuarters
    {
        get { return _numQuarters; }
    }

public int NumCandyBars
    {
        get { return _numCandyBars; }
    }

// Public methods:

public string DepositQuarter()
    {
        _numQuarters++;
        return "Quarter deposited.";
    }

public string SelectCandy()
    {
        if (_numQuarters >= 3 && _numCandyBars > 0)
        {
            _numQuarters = 0;
            _numCandyBars--;
            return "Candy bar dispensed";
        }
        else if (_numCandyBars > 0)
        {
            return "Not enough quarters to buy candy bar.";
        }
        else
        {
            return "No candy bars in machine.";
        }
    }
}