isnan()

NAME

isnan(), isnanf() - test argument for Not A Number

SYNOPSIS

#include <math.h>


int isnan (double x)
int isnanf (float x)

DESCRIPTION

The isnan(3) and isnanf(3) functions test the argument x to see if it is not a number.

RETURN VALUES

The isnan(3) and isnanf(3) functions return 1 if the argument x is NaN, and return 0 otherwise.

SEE ALSO

isinf(3)

math(3)