## Linux and UNIX Man Pages

Test Your Knowledge in Computers #870
Difficulty: Medium
Lisp introduced the concept of automatic garbage collection.
True or False?

# isinf(3m) [opensolaris man page]

```isinf(3M)						  Mathematical Library Functions						 isinf(3M)

NAME
isinf - test for infinity

SYNOPSIS
c99 [ flag... ] file... -lm [ library... ]
#include <math.h>

int isinf(real-floating x);

DESCRIPTION
The  isinf()  macro determines whether its argument value is an infinity (positive or negative). First, an argument represented in a format
wider than its semantic type is converted to its semantic type. Then determination is based on the type of the argument.

RETURN VALUES
The isinf() macro returns a non-zero value if and only if its argument has an infinite value.

ERRORS
No errors are defined.

ATTRIBUTES
See attributes(5) for descriptions of the following attributes:

+-----------------------------+-----------------------------+
|      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
+-----------------------------+-----------------------------+
|Interface Stability	     |Standard			   |
+-----------------------------+-----------------------------+
|MT-Level		     |MT-Safe			   |
+-----------------------------+-----------------------------+

fpclassify(3M), isfinite(3M), isnan(3M), isnormal(3M), math.h(3HEAD), signbit(3M), attributes(5), standards(5)

SunOS 5.11							    17 Nov 2008 							 isinf(3M)```

## Check Out this Related Man Page

```isnormal(3M)						  Mathematical Library Functions					      isnormal(3M)

NAME
isnormal - test for a normal value

SYNOPSIS
#include <math.h>

int isnormal(real-floating x);

DESCRIPTION
The  isnormal() macro determines whether its argument value is normal (neither zero, subnormal, infinite, nor NaN). First, an argument rep-
resented in a format wider than its semantic type is converted to its semantic type. Then determination is based on the type of	the  argu-
ment.

RETURN VALUES
The isnormal() macro returns a non-zero value if and only if its argument has a normal value.

ERRORS
No errors are defined.

ATTRIBUTES
See attributes(5) for descriptions of the following attributes:

+-----------------------------+-----------------------------+
|      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
+-----------------------------+-----------------------------+
|Interface Stability	     |Standard			   |
+-----------------------------+-----------------------------+
|MT-Level		     |MT-Safe			   |
+-----------------------------+-----------------------------+