NAME
isgreater
,
isgreaterequal
, isless
,
islessequal
, islessgreater
,
isunordered
—
compare two floating-point
numbers
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 at least one of the arguments is NaN. For any pair
of floating-point values, one of the relationships (less, greater, equal,
unordered) holds.
SEE ALSO
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 OpenBSD 4.4.