compare(3C)

NAME
     isgreater, isgreaterf, isgreaterl, isgreaterequalf, isgreaterequall,
     islessf, islessl, islessequalf, islessequall, islessgreaterf,
     isgreaterequal, isless, islessequal, islessgreater, signbit, signbitf,
     signbitl  - comparison macros

SYNOPSIS
     #include <math.h>

     int isgreater(doublex, double y);
     int isgreaterequal(double x, double y);
     int isless(double x, double y);
     int islessequal(double x, double y);
     int islessgreater(double x, double y);
     int signbit(x);

DESCRIPTION
     These routines are not available for programs compiled with the O32 ABI.

     Functions in the standard math library (libm.a) are referred to as -lm
     versions. Those in mathx library (libmx.a) are referred to as -lmx
     versions, and those in the the BSD math library (libm43.a) are referred
     to as -lm43 versions.

     These macros are quiet (non floating-point exception raising) versions of
     the relational operators. double in the synopsis lines indicates that the
     argument shall be an expression of real floating type.

     The isgreater macro determines if its first argument is greater than its
     second argument.

     The isgreaterequal macro determines if its first argument is greater than
     or equal to its second argument.

     The isless macro determines if its first argument is less than its second
     argument.

     The islessequal macro determines if its first argument is less than or
     equal to its second argument.

     The islessgreater macro determines if its first argument is less than or
     greater than its second argument.

     The signbit macro determines if the sign of its argument value is
     negative.

     These macros are implemented in terms of ordinary functions depending on
     the argument used; for example, if x is a float value, the macro is
     redefined as isgreaterf.  If x is double, the macro is redefined as
     isgreater.  If x is long double, the macro is redefined as isgreaterl.
NOTES
     Long double operations on this system are only supported in round to
     nearest rounding mode (the default).  The system must be in round to
     nearest rounding mode when calling any of the long double functions, or
     incorrect answers will result.

RETURN VALUES
     The -lm and -lmx versions always return the default Quiet NaN and set
     errno to EDOM when a NaN is used as an argument.  A NaN argument usually
     causes the -lm43 versions to return the same argument.  The -lm43
     versions never set errno.

     See matherr(3M) for a description of error handling for -lmx functions.

SEE ALSO
     math(3M), exp(3M), matherr(3M)