FPCLASSIFY(3M) Mathematical Library Functions FPCLASSIFY(3M)

fpclassify - classify real floating type

c99 [ flag... ] file... -lm [ library... ]
#include <math.h>
int fpclassify(real-floating x);

The fpclassify() macro classifies its argument value as NaN, infinite, normal, subnormal, or zero. First, an argument represented in a format wider than its semantic type is converted to its semantic type. Then classification is based on the type of the argument.

The fpclassify() macro returns the value of the number classification macro appropriate to the value of its argument.

No errors are defined.

See attributes(7) for descriptions of the following attributes:

Interface Stability Standard
MT-Level MT-Safe

math.h(3HEAD), isfinite(3M), isinf(3M), isnan(3M), isnormal(3M), signbit(3M), attributes(7), standards(7)

July 12, 2006 SunOS 5.11