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.
SEE ALSO
fpclassify(3), math(3), signbit(3)
STANDARDS
HISTORY
