fpclassify
—
classify real floating type
Standard C Library (libc, -lc)
#include <math.h>
int
fpclassify
(real-floating
x);
The fpclassify
() macro performs classification of its
argument x. An argument represented in a format wider
than its semantic type is converted to its semantic type first. The
classification is then based on the type of the argument.
The fpclassify
() macro returns the value of the number
classification macro appropriate to its argument x as
described above.
The fpclassify
() macro conforms to
ISO/IEC 9899:1999 (“ISO C99”).