std::fpclassify

Defined in header `<cmath>`

int fpclassify( float arg );		(C++11 feature)

int fpclassify( double arg );		(C++11 feature)

int fpclassify( long double arg );		(C++11 feature)

Categorizes floating point value arg into the following categories: zero, subnormal, normal, infinite, NAN, or implementation-defined category.

arg - floating point value

one of FP_INFINITE, FP_NAN, FP_NORMAL, FP_SUBNORMAL, FP_ZERO or implementation-defined type, specifying the category of arg.

isfinite (C++11)

checks if the given number has finite value
(function)

isinf (C++11)

checks if the given number is infinite
(function)

isnan (C++11)

checks if the given number is NaN
(function)

isnormal (C++11)

checks if the given number is normal
(function)