在C ++中将浮点数转换为std :: string [英] Converting a float to std::string in C++

问题描述

这是一个看似简单的问题，但我很难提出答案。我有一个float值，需要放入std :: string，如下：

This is a seemingly simple problem, but I'm having difficulty coming up with an answer. I have a float value that needs to be put into a std::string, like so:

float val = 2.5;
std::string my_val = val; // error here

显然它们有不同的类型。如何从float转换为字符串？

Obviously they're of different types. How do I convert from float to string?

所有的帮助都很感激。

推荐答案

除非您担心效果，请使用字符串流：

Unless you're worried about performance, use string streams:

std::ostringstream ss;
ss << myFloat;
std::string s(ss.str());

如果您对Boost， lexical_cast<> 是一个方便的选择：

If you're okay with Boost, lexical_cast<> is a convenient alternative:

std::string s = boost::lexical_cast<std::string>(myFloat);

FastFormat 或简单的C风格函数。

Efficient alternatives are e.g. FastFormat or simply the C-style functions.

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