C++验证循环问题

Question

我对c ++很新,我非常接近解决方案,但我仍然需要一些帮助.我的循环第一次正常工作.之后,当我输入车号时,它似乎在某处抓取一些输入,并在第二遍时执行无效颜色.显然,我错过了什么,但我不知所措.任何帮助,将不胜感激.

这只是我程序的一小部分,但是存在问题:

while (count < 3)
{
    cout << endl << "Enter car color: blue, red or green in lower case.  ";
    getline(cin, carColor[count]);

    if (!(carColor[count] == "blue" || carColor[count] == "red" || carColor[count] == "green"))
    {
        cout << "That is an invalid color"
            << "The program will exit";
        cin.clear();
        cin.ignore();
        return 0;
    }


    cout << endl << "Enter car number between 1 and 99: ";
    cin >> carNumber[count];                   // Enter car number
    if (carNumber[count] >99 || carNumber[count] < 1)
    {
        cout << "That is not a correct number"
            << " The program will exit";
        return 0;
    }

    cout << "car no is:" << carNumber[count] << "color: " << carColor[count];


    ++count;
//  int lapCount{ 1 };

    cout << endl;

}

Answer 1

'\n'按 Enter 键后的字符可能cin >> carNumber[count];仍然保留，因此在执行第二遍后getline(cin, carColor[count]);您会得到一个空字符串。一种解决方案是这样做：

char c;
cin >> carNumber[count];
cin >> c;

但更好的解决方案就是改变：

getline(cin, carColor[count]);

到：

cin >> carColor[count];