整数的用户输入 - 错误处理

问题描述

我的程序的某些输入区域有问题.用户输入特定整数的部分有几个部分.即使他们输入了错误的，也很好，但我注意到如果他们输入了任何非整数类型的东西，比如m"，那么它会重复循环错误消息.

I'm having some trouble with certain input areas of my program. There are a few parts where the user inputs a specific integer. Even if they enter the wrong one that's all fine and dandy, but I noticed if they enter anything not of integer type like 'm' then it will loop the error message repeatedly.

我有几个具有整数输入的函数.这是一个示例.

I have a couple functions that have integer input in them. Here's one for an example.

void Room::move(vector<Room>& v, int exone, int extwo, int exthree, int current)
{
    v[current].is_occupied = false;
    int room_choice;
    cout << "
Enter room to move to: ";
    while(true)
    {
        cin >> room_choice;
        if(room_choice == exone || room_choice == extwo || room_choice == exthree)
        {
            v[room_choice].is_occupied = true;
            break;
        }
        else cout << "Incorrect entry. Try again: ";
    }
}

推荐答案

您可以使用 cin.good() 或 cin.fail() 来判断 cin 是否可以成功处理提供的输入值.如有必要，您可以在继续处理之前使用 cin.clear() 清除错误状态.

You can use cin.good() or cin.fail() to determine whether cin could successfully deal with the input value provided. You can then use cin.clear(), if necessary, to clear the error state before continuing processing.

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