c++ - 限制用户输入

Question

我已经编写了以下代码，并且在很大程度上它完成了我想要它做的事情。问题在于，当用户输入“111”之类的内容时，输出为“您输入了数字 1”。我想将用户的输入限制为 1 个字符。有什么建议么？我确定解决方案非常简单，但我无法弄清楚。此外，代码必须保持 switch 语句的形式。谢谢!

#include <iostream>
using namespace std;

int main()
{
    char i;

    cout << "Please enter a number between 1 and 9." << endl;
    cout << "Enter a number: ";
    cin >> i;

    switch (i)
        {
        case '1':
            cout << "You entered the number one." << endl;
            break;

        case '2':
            cout << "You entered the number two." << endl;
            break;

        case '3':
            cout << "You entered the number three." << endl;
            break;

        case '4':
            cout << "You entered the number four." << endl;
            break;

        case '5':
            cout << "You entered the number five." << endl;
            break;

        case '6':
            cout << "You entered the number six." << endl;
            break;

        case '7':
            cout << "You entered the number seven." << endl;
            break;

        case '8':
            cout << "You entered the number eight." << endl;
            break;

        case '9':
            cout << "You entered the number nine." << endl;
            break;

        default:
            cout << "You did not enter a valid number." << endl;
            break;
        }

    system("pause");
    return 0;
}

Answer 1

您可以使用 c 标准 io 库中的 getchar(char)。

    #include <stdio.h>
    ...
    char i;
    int j;

    cout << "Please enter a number between 1 and 9." << endl;
    cout << "Enter a number: ";
    getchar(j);
    i=(char)j;
    switch(i){
    ...