NAME
isgreater,
isgreaterequal, isless,
islessequal, islessgreater,
isunordered —
compare two floating-point
numbers
LIBRARY
library “libc”
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 macrosisgreater(),
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.
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 FreeBSD 5.1.