7.12.3.2 The isfinite macro

Synopsis

1

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

Description

2

The isfinite macro determines whether its argument has a finite value (zero, subnormal, or normal, and not infinite or 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 isfinite macro returns a nonzero value if and only if its argument has a finite value.