Stringstream 无法正确转换

Question

首先，我使用的是 Windows 8.1、Visual Studio 2013 Express 和 c++。虽然不知道我使用的是哪个 C++ 标准。

我完全不熟悉编程，所以我可能错过了这个函数中的一些基本部分。我正在做一个有 10 个问题的测验，这个测验是关于 MJ 去世的时间。我正在尝试确保如果用户使用 getline().

输入 int 以外的内容，程序不会崩溃

我了解了 stringstream 并进行了转换。它应该将 "playerAnswer" 转换为 int。我正在使用 #include <iostream> #include <string> #include <sstream> 和 using namespace std;

int question_3()
{

    cout << "Question 3:\n";

    string playerAnswer = "";
    int convertedAnswer = 0;    

    cout << "Which year did Michael Jackson die? 2008, 2009 or 2010?\n" \
            "Your answer: ";

    while (true)
    {
        getline(cin, playerAnswer);
        stringstream convHolder;   // EDIT: Got an answer and it now works.
                                   // Forgot  (playerAnswer) in convHolder
        if (convHolder >> convertedAnswer)
        {
            if (convertedAnswer == 2009)
            {
                cout << endl << "Correct! \nOn August 29 1958 the legend was born. \n" \
                                "On June 25 2009 he passed away in his rented mansion in Holmby Hills.\n";
                cout << endl;
                return 1;
            }
            else
            {
                cout << endl << "Wrong. \nOn August 29 1958 the legend was born. \n" \
                                "On June 25 2009 he passed away in his rented mansion in Holmby Hills.\n";
                cout << endl;
                return 0;
            }
        }
        else
        {
            cout << "Invalid number, please try again: ";
        }
    }
}

如果您能让它按预期工作并使用更好的 way/with 更短的代码，我将非常有兴趣学习它 :) 欢迎大家提供任何意见！

/尼克

Answer 1

您没有初始化字符串流以使用用户输入的字符串：

stringstream convHolder;

应该是

stringstream convHolder(playerAnswer);

Stringstream 无法正确转换

Stringstream won't convert properly

c++

windows

visual-studio-2013

console-application

stringstream