ISINFF(3)

NAME
isinff, isnanf - test for infinity or not-a-number

LIBRARY
libm

SYNOPSIS
#include <math.h>
int
isinff(float);
int
isnanf(float);

DESCRIPTION
The isinff() function returns 1 if the number is “”, otherwise 0.

The isnanf() function returns 1 if the number is “not-a-number”, otherwise 0.

SEE ALSO
isinf(3), isnan(3), math(3) IEEE Standard for Binary Floating-Point Arithmetic, ANSI, Std 754-1985.

BUGS
Neither the VAX nor the Tahoe floating point have distinguished values for either infinity or not-a-number. These routines always return 0 on those architectures.