## Linux and UNIX Man Pages

Test Your Knowledge in Computers #527
Difficulty: Medium
ASCII was originally developed in the early 1940s.
True or False?

# isunordered(3m) [sunos man page]

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

NAME
isunordered - test if arguments are unordered

SYNOPSIS
#include <math.h>

int isunordered(real-floating x, real-floating y);

DESCRIPTION
The isunordered() macro determines whether its arguments are unordered.

RETURN VALUES
Upon successful completion, the isunordered() macro returns 1 if its arguments are unordered and 0 otherwise.

ERRORS
No errors are defined.

USAGE
The  relational and equality operators support the usual mathematical relationships between numeric values. For any ordered pair of numeric
values, exactly one of the relationships (less, greater, and equal) is true. Relational operators  can  raise  the  invalid  floating-point
exception  when	argument  values  are  NaNs. For a NaN and a numeric value, or for two NaNs, just the unordered relationship is true. This
macro is a quiet (non-floating-point exception raising) version of a relational	operator.  It  facilitates  writing  efficient	code  that
accounts  for  quiet NaNs without suffering the invalid floating-point exception. In the SYNOPSIS section, real-floating indicates that the
argument shall be an expression of real-floating type.

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

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

isgreater(3M), isgreaterequal(3M), isless(3M), islessequal(3M), islessgreater(3M), math.h(3HEAD), attributes(5), standards(5)

SunOS 5.10							    1 Nov 2003							   isunordered(3M)```

## Check Out this Related Man Page

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

NAME
islessequal - test if x is less than or equal to y

SYNOPSIS
#include <math.h>

int islessequal(real-floating x, real-floating y);

DESCRIPTION
The  islessequal() macro determines whether its first argument is less than or equal to its second argument. The value of islessequal(x, y)
is equal to (x) <= (y); however, unlike (x) <= (y), islessequal(x, y) does not raise the invalid floating-point exception when x and y  are
unordered.

RETURN VALUES
Upon successful completion, the islessequal() macro returns the value of (x) <= (y).

If x or y is NaN, 0 is returned.

ERRORS
No errors are defined.

USAGE
The  relational and equality operators support the usual mathematical relationships between numeric values. For any ordered pair of numeric
values, exactly one of the relationships (less, greater, and equal) is true. Relational operators  can  raise  the  invalid  floating-point
exception  when	argument  values  are  NaNs. For a NaN and a numeric value, or for two NaNs, just the unordered relationship is true. This
macro is a quiet (non-floating-point exception raising) version of a relational	operator.  It  facilitates  writing  efficient	code  that
accounts  for  quiet NaNs without suffering the invalid floating-point exception. In the SYNOPSIS section, real-floating indicates that the
argument is an expression of real-floating type.

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

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