FPCLASSIFY(3) BSD Programmer's Manual FPCLASSIFY(3)
fpclassify - classify real floating type
libc
#include <math.h> int fpclassify(real-floating x);
The fpclassify() macro performs classification of its argument x. An ar- gument 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.
FP_INFINITE infinity, either positive or negative FP_NAN not-a-number ("NaN") FP_NORMAL normal FP_SUBNORMAL subnormal FP_ZERO zero
FP_ROP reserved operand ("ROP") FP_DIRTYZERO dirty zero FP_NORMAL finite FP_ZERO true zero
The fpclassify() macro returns the value of the number classification macro appropriate to its argument x as described above.
No errors are defined.
isfinite(3), isnormal(3), math(3), signbit(3)
The fpclassify() macro conforms to ISO/IEC 9899:1999 ("ISO C99"). MirBSD #10-current January 14, 2004 1