C ++验证循环问题

时间:2016-04-17 02:40:18

标签: c++ validation

我对c ++很陌生,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;

}

1 个答案:

答案 0 :(得分:4)

'\n'中按Enter后,cin >> carNumber[count];字符可能仍然保持不变,执行getline(cin, carColor[count]);的第二次传递后,您将获得一个空字符串。一种解决方案是:

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

但更好的解决方案就是改变:

getline(cin, carColor[count]);

为:

cin >> carColor[count];