ISINFF(3)
Library Functions Manual
ISINFF(3)
NAME
isinff
,
isnanf
—
test for infinity or not-a-number
LIBRARY
Math Library (libm, -lm)
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”, otherwise 0.
SEE ALSO
isinf(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.
August 16, 1999
NetBSD 5.99