Stringstream將無法正確轉換

-2

首先，我使用Windows 8.1，Visual Studio 2013 Express和C++。不知道我在用哪個C++標準。Stringstream將無法正確轉換

我完全不熟悉編程，所以我可能錯過了這個函數的一些基本部分。我正在做一個10個問題的測驗，這是關於MJ何時去世的。我試圖確保如果用戶使用getline()來輸入int以外的內容，程序不會崩潰。

我瞭解了stringstream並轉換。它應該將「playerAnswer」轉換爲int。我使用#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: "; 
     } 
    } 
}

如果你能按預期工作，以更好的方式/用較短的代碼，我會非常有興趣去學習吧:)從你們的任何輸入appriciated！

/NICKL

來源

2015-05-06 NickL

_「，但這似乎並沒有不工作「_是模糊地問。請提供[MCVE]（http://stackoverflow.com/help/mcve）。另見[這裏]（http://stackoverflow.com/questions/24504582/how-to-test-whether-stringstream-operator-has-parsed-a-bad-type-and-skip-it）和[這裏] （http://stackoverflow.com/questions/23047052/why-does-reading-a-struct-record-fields-from-stdistream-fail-and-how-can-i-fi）。 –

您還沒有初始化你的stringstream使用的字符串，用戶輸入：

stringstream convHolder;

應該

stringstream convHolder(playerAnswer);

來源

2015-05-06 20:47:56 dwcanillas

謝謝。小錯誤，但看不到它。現在我該如何解決這個問題並選擇你的答案作爲解決問題的辦法？ – NickL

@NickL你點擊箭頭旁邊的複選標記/我的答案分數 – dwcanillas

Stringstream將無法正確轉換

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