You can use std::fpclassify
or any of the related functions.
How to verify special values in C++
質問
If in C++ I got the any of the following values, how to verify or compare them?
float pinf = std::numeric_limits<float>::infinity();
double dpinf = std::numeric_limits<double>::infinity();
float ninf = -std::numeric_limits<float>::infinity();
float NaN = std::numeric_limits<float>::quiet_NaN();
float nNaN = -std::numeric_limits<float>::quiet_NaN();
double dNaN = std::numeric_limits<double>::quiet_NaN();
解決
所属していません StackOverflow