Copyright (c) 1991 The Regents of the University of California.
All rights reserved.
%sccs.include.redist.man%
@(#)isinf.3 5.1 (Berkeley) 03/18/91
All rights reserved.
%sccs.include.redist.man%
@(#)isinf.3 5.1 (Berkeley) 03/18/91
ISINF 3 ""
C 7 NAME
isinf, isnan - return if infinity or not-a-number
SYNOPSIS
int isinf(double); int isnan(double); .fr R
DESCRIPTION
Isninf returns 1 if the number is ``infinity'', otherwise 0.
Isnan returns 1 if the number is ``NaN'', otherwise 0.
SEE ALSO
math (3) "IEEE Standard for Binary Floating-Point Arithmetic" , ANSI/IEEE 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.