C ++字符测试； 输入特定字母后，如何使程序正常结束？

Question

该实验室专注于测试字符。 我应该输入一个字符，如果它是大写字母，小写字母或其他类型，它将读取。 我的if陈述是正确的。 我提示和阅读我所发表内容的陈述也可以。 问题是当我输入q或Q使程序结束时，程序仍会读取我输入的q或Q。 输入程序后，程序是否应该结束并且不阅读那些字母？

 int main()
    {
        char input = ' ';

        //set up loop such that all tasks below is done as long as input
        // is not a q or a Q (that is, quit)
        while (toupper(input) != 'Q' || tolower(input) != 'q') 
        {
            cout << "Enter any character: ";
            cin.get(input);
            cin.ignore(); 
            cout << "The character you entered is: " << input << endl;

            if (isalpha(input))
                cout << "That's an alphabetic character.\n";
            if (isdigit(input))
                cout << "That's a numeric digit.\n";
            if (islower(input))
                cout << "The letter you entered is lowercase.\n";
            if (isupper(input))
                cout << "The letter you entered is uppercase.\n";
            if (isspace(input))
                cout << "That's a whitespace character.\n";

            //add code to test for alphanumeric 
            if (isalnum(input))
                cout << "The character you entered is alphanumeric.\n"; 

            //add code for a punctuation
            if (ispunct(input))
                cout << "The character you entered is a punctuation.\n";
        } 

        system("PAUSE"); 
        return 0;
    }

Answer 1

删除system("PAUSE"); 然后再试一次。

用“ q”或“ Q”退出while循环后，程序/控制台仍坐在那里等待输入/输出。