ISINFF(3) BSD Programmer's Manual 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 "Infinity", otherwise 0.
The isnanf() function returns 1 if the number is "not-a-number", other-
wise 0.
SEE ALSOisinf(3), isnan(3), math(3)
IEEE Standard for Binary Floating-Point Arithmetic, Std 754-1985, ANSI.
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.
MirOS BSD #10-current August 16, 1999 1