C ++ IsFloat函数 [英] C++ IsFloat function

问题描述

有人知道确定字符串值是否合格为浮点数的方便方法？

Does anybody know of a convenient means of determining if a string value "qualifies" as a floating-point number?

BOOL IsFloat( string MyString )
{
   ... etc ...

   return ... // TRUE if float; FALSE otherwise
}

推荐答案

t使用Boost库函数，可以像这样编写自己的isFloat函数。

If you can't use a Boost library function, you can write your own isFloat function like this.

#include <string>
#include <sstream>

bool isFloat( string myString ) {
    std::istringstream iss(myString);
    float f;
    iss >> noskipws >> f; // noskipws considers leading whitespace invalid
    // Check the entire string was consumed and if either failbit or badbit is set
    return iss.eof() && !iss.fail(); 
}

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