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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.
See attributes(5) for descriptions of the following attributes:
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isfinite(3M), isinf(3M), isnan(3M), isnormal(3M), math.h(3HEAD), signbit(3M), attributes(5), standards(5)
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