ISINF
Section: C Library Functions (3)
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BSD mandoc
NAME
isinf
isnan
- test for infinity or not-a-number
SYNOPSIS
Ft int
Fn isinf double
Ft int
Fn isnan double
DESCRIPTION
The
Fn isninf
function
returns 1 if the number is
``\*(If ,
''
otherwise 0.
The
Fn isnan
function
returns 1 if the number is
``not-a-number''
otherwise 0.
SEE ALSO
math(3)
-
"IEEE Standard for Binary Floating-Point Arithmetic"
ANSI
Std 754-1985
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.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- SEE ALSO
-
- BUGS
-
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Time: 15:52:50 GMT, January 15, 2023