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 any of x or 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.