7.12.3.5 The isnormal macro

Synopsis

1

#include <math.h>
int isnormal(real-floating x);

Description

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The isnormal macro determines whether its argument value is normal (neither zero, subnormal, infinite, nor NaN). First, an argument represented in a format wider than its semantic type is converted to its semantic type. Then determination is based on the type of the argument.

Returns

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The isnormal macro returns a nonzero value if and only if its argument has a normal value.