当物品价格上涨时保持价值

为学校制作了一个糖果机程序。问题是，当一件东西比我拥有的要贵的时候，它仍然会把我的钱减少到零，但不会带走这个东西。

我的代码

  #include "stdafx.h"
#include <iostream>
using namespace std;


int _tmain(int argc, _TCHAR* argv[])
{
    int money = 30;
    int x = 15;
    char input;
    int japp = 5;
    int daim = 7;
    int cocacola = 10;
    int fanta = 10;

    cout << " Welcome to my candy machine" << endl;
    cout << " choose one of the following items" << endl;
    cout << endl;
    cout << endl;
    while (x != 22)

    {

        if (money <= 0)
        {
            cout << endl;
            cout << "Your have no money left!!  therefore you cant shop anymore " << endl;
            cout << endl;
            cout << endl;
            money = 0;
        }



        cout << "Slott 1 JAPP  " << japp << "  10 kronor" << endl;
        cout << "Slott 2 Daim  " << daim <<"  10 kronor"<< endl;
        cout << "Slott 3 coca cola  " << cocacola <<"  15 kronor "<< endl;
        cout << "Slott 4 Fanta  " << fanta <<"  15 kronor"<< endl;
        cout << endl;
        cout << endl;
        cout << " you have " << money << " kronor left" << endl;
        cout << endl;
        cout << endl;
        cout << "abort [A]" << endl;

        cin >> input;
        switch (input)
        {
        case '1':

             if (japp <= 5)
            {
                cout << endl;
                cout << endl;
                japp--;
                money -= 10;
            }
            if (japp <= 0)
            {
                cout << " there is no moore japp!!" << endl;
                cout << endl;
                japp = 0;
            }
            if (money <= -1)
            {
                japp++;
            }
            break;
        case '2':

            if (daim <= 7)
            {
                daim--;
                money -= 10;
            }
            if (daim <= 0)
            {
                cout << " there is no more daim !!" << endl;
                cout << endl;
                daim = 0;
            }
            if (money <= -1)
            {
                daim++;
            }
            break;
        case'3':
            if (cocacola <= 10)
            {
                cocacola--;
                money -= 15;
            }
            if (cocacola <= 0)
            {
                cout << "there is no more coke !!" << endl;
                cout << endl;
                cocacola = 0;
            }
            if (money <= -1)
            {
                cocacola++;
            }
            break;
        case '4':
            if (fanta <= 10)
            {
                fanta--;
                money -= 15;
            }
            if (fanta <= 0)
            {
                cout << " there is no moore fanta !!" << endl;
                cout << endl;
                fanta = 0;
            }
            if (money <= -1)
            {
                fanta++;
            }
            break;
        case 'A':
            cout << " ending the game...." << endl;
            return 0;
        case 'a':
            cout << " ending the game.... " << endl;
            return 0;
        default:
            cout << " wrong option, pleas choose between option 1 - 4 " << endl;
            cout << endl;
            cout << endl;
            break;
        }
    }

    return 0;
}

感谢你对我的帮助