NAME
isinff
, isnanf
— test for infinity or
not-a-number
LIBRARY
library “libm”
SYNOPSIS
#include
<math.h>
int
isinff
(float);
int
isnanf
(float);
DESCRIPTION
Theisinff
()
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
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.