NAME
isfinite —
test for finite value
LIBRARY
library “libc”
SYNOPSIS
#include
<math.h>
int
isfinite(real-floating
x);
DESCRIPTION
Theisfinite()
determines whether its argument x has a finite value. An
argument represented in a format wider than its semantic type is converted to
its semantic type first. The determination is then based on the type of the
argument.
IEEE 754
It is determined whether the value of x is zero, subnormal, or normal, and neither infinite nor NaN.
VAX
It is determined whether the value of x is true zero or finite, and neither dirty zero nor ROP.
RETURN VALUES
The isfinite() macro returns a non-zero
value if the value of x is finite. Otherwise 0 is
returned.
ERRORS
No errors are defined.
SEE ALSO
STANDARDS
The isfinite() macro conforms to
ISO/IEC 9899:1999
(“ISO C99”).