字符串解析在C ++中双重失败 [英] string parsing to double fails in C++

问题描述

这是一个有趣的，我一直在努力弄清楚。我有以下程序：

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();
}

输出为：

0
1

知道为什么这是失败。请告诉我我在做什么？

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

感谢，

helixed

编辑：

好的，很抱歉将其变成 double post ，但这看起来像一个特定于Xcode的问题。如果我编译这个在g ++，代码工作没有问题。有没有人知道为什么这是发生在Xcode，我怎么可能解决它？

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?

推荐答案

也许这是问题您拥有： http://stackoverflow.com/questions/1377038/stringstream-question

Perhaps this is the problem you're having: http://stackoverflow.com/questions/1377038/stringstream-question

请参阅接受的答案和其中的链接。 Apple讨论链接中的示例非常类似于您遇到的问题。

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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