ISNAN(3) Library Functions Manual ISNAN(3)

NAME

isnan — test for a NaN

SYNOPSIS

#include <math.h>

int isnan(double x);

The isnan () function tests whether x is NaN.

On systems not supporting NaN values, isnan() always returns 0.

The isnan() function returns non-zero if x is NaN. Otherwise, 0 is returned.

No errors are defined.

None.

None.

None.