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