// Test VendingMachine class.
static void Main()
{
    // Declare VendingMachine reference variable.
    VendingMachine vm; 

    // Instantiate VendingMachine object.
    vm = new VendingMachine();

    // Test ToString method of vm.
    Console.WriteLine(vm.ToString());

    // Try to buy 6 candy bars.  vm has only five candy 
    // bars, so the 6th time will not be successful.
    // Each candy bar requires 3 quarters.
    for (int i = 1; i <= 6; i++)
    {
        for (int j = 1; j <= 3; j++)
        {
            Console.WriteLine(vm.DepositQuarter());
        }
        Console.WriteLine(vm.SelectCandy());
    }
    Console.ReadLine();
}