# isunordered(3) [freebsd man page]

```ISGREATER(3)						   BSD Library Functions Manual 					      ISGREATER(3)

NAME
isgreater, isgreaterequal, isless, islessequal, islessgreater, isunordered -- compare two floating-point numbers

LIBRARY
Standard C Library (libc, -lc)

SYNOPSIS
#include <math.h>

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

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

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

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

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

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

DESCRIPTION
Each of the macros isgreater(), isgreaterequal(), isless(), islessequal(), and islessgreater() take arguments x and y and return a non-zero
value if and only if its nominal relation on x and y is true.  These macros always return zero if either argument is not a number (NaN), but
unlike the corresponding C operators, they never raise a floating point exception.

The isunordered() macro takes arguments x and y and returns non-zero if and only if neither x nor y are NaNs.  For any pair of floating-point
values, one of the relationships (less, greater, equal, unordered) holds.

fpclassify(3), math(3), signbit(3)

STANDARDS
The isgreater(), isgreaterequal(), isless(), islessequal(), islessgreater(), and isunordered() macros conform to ISO/IEC 9899:1999
(``ISO C99'').

HISTORY
The relational macros described above first appeared in FreeBSD 5.1.

BSD								 February 12, 2003							       BSD```

## Check Out this Related Man Page

```ISGREATER(3)						   BSD Library Functions Manual 					      ISGREATER(3)

NAME
isgreater, isgreaterequal, isless, islessequal, islessgreater, isunordered -- compare two floating-point numbers

LIBRARY
Standard C Library (libc, -lc)

SYNOPSIS
#include <math.h>

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

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

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

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

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

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

DESCRIPTION
Each of the macros isgreater(), isgreaterequal(), isless(), islessequal(), and islessgreater() take arguments x and y and return a non-zero
value if and only if its nominal relation on x and y is true.  These macros always return zero if either argument is not a number (NaN), but
unlike the corresponding C operators, they never raise a floating point exception.

The isunordered() macro takes arguments x and y and returns non-zero if and only if neither x nor y are NaNs.  For any pair of floating-point
values, one of the relationships (less, greater, equal, unordered) holds.