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int fpclassify( float arg );
 ( C++11)
int fpclassify( double arg );
 ( C++11)
int fpclassify( long double arg );
 ( C++11)
arg : , , , , NAN, .
:
Categorizes floating point value arg into the following categories: zero, subnormal, normal, infinite, NAN, or implementation-defined category.
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arg
:
floating point value
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FP_INFINITE, FP_NAN, FP_NORMAL, FP_SUBNORMAL, FP_ZERO , arg.
:
one of FP_INFINITE, FP_NAN, FP_NORMAL, FP_SUBNORMAL, FP_ZERO or implementation-defined type, specifying the category of arg.
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