Question

首先，我使用的是Windows 8.1，Visual Studio 2013 Express和c ++。不知道我正在使用哪种C ++标准。

我对编程完全陌生，所以我可能错过了这个功能的一些基本部分。我正在进行一个10个问题的测验，这个是关于MJ去世的时候。如果用户使用int输入getline()之外的其他内容，我会尝试确保程序不会崩溃。

我了解了stringstream并进行转换。它应该转换为＆＃34; playerAnswer＆＃34;到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: ";
        }
    }
}

如果你能够按照预期的方式工作，并以更好的方式/使用更短的代码，我就会非常有兴趣学习它:)你们的任何意见都是适当的！

/ NICKL

Answer 1

您没有初始化stringstream以使用用户输入的字符串：

$json = json_decode($row['elements']);
echo $json->book->{0}->title;

应该是

stringstream convHolder;

Stringstream不能正常转换

1 个答案: