字符串解析到双重失败在C ++中 [英] string parsing to double fails in C++

问题描述

这是一个有趣的，我一直在努力想出来。我有以下程序：

  #include< iostream> 
 #include< string> 
 #include< sstream> 
 
使用namespace std; 
 
 int main（int argc，char * argv []）
 {
 string s（5）; 
 istringstream stream; 
 
 double theValue; 
 stream>>价值; 
 
 cout<<< theValue< ENDL; 
 cout<<< stream.fail（）; 
} 
  

输出是：

  0 
 1 
  

不明白为什么这是失败的。有人可以告诉我我做错了什么？

谢谢，

helixed

编辑：

对不起，把它变成一个双发帖，但这看起来像是Xcode特有的问题。如果我用g ++编译这个代码，代码就没有任何问题。有没有人知道为什么在Xcode中发生这种情况，以及我如何解决它？

解决方案

也许这是问题你有： stringstream问题

看到接受的答案和其中的链接。苹果讨论链接中的一个例子听起来非常像你所遇到的。

Here's a fun one I've been trying to figure out. I have the following program:

#include <iostream>
#include <string>
#include <sstream>

using namespace std;

int main(int argc, char *argv[])
{
    string s("5");
    istringstream stream(s);

    double theValue;
    stream >> theValue;

    cout << theValue << endl;
    cout << stream.fail();
}

The output is:

0
1

I don't understand why this is failing. Could somebody please tell me what I'm doing wrong?

Thanks,

helixed

EDIT:

Okay, sorry to turn this into a double post, but this looks like a problem specific to Xcode. If I compile this in g++, the code works without a problem. Does anybody have an idea why this is happening in Xcode, and how I could possibly fix it?

解决方案

Perhaps this is the problem you're having: stringstream question

See the accepted answer and the link therein. An example in the Apple discussion link sounds very much like what you're experiencing.

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