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.