isgreater - phpMan

ISGREATER(3)               Linux Programmer’s Manual              ISGREATER(3)



NAME
       isgreater,  isgreaterequal,  isless,  islessgreater, isunordered - macros to test a
       relation

SYNOPSIS
       #include <math.h>

       int isgreater(x,y);

       int isgreaterequal(x,y);

       int isless(x,y);

       int islessequal(x,y);

       int islessgreater(x,y);

       int isunordered(x,y);

DESCRIPTION
       The normal relation operations (like less) will fail if one of the operands is NaN.
       This  will  cause an exception. To avoid this, C99 defines these macros. The macros
       are guaranteed to evaluate their operands only once.  The operand  can  be  of  any
       real floating-point type.

       isgreater()
              determines (x) > (y) without an exception if x or y is NaN.

       isgreaterequal()
              determines (x) >= (y) without an exception if x or y is NaN.

       isless()
              determines (x) < (y) without an exception if x or y is NaN.

       islessequal()
              determines (x) <= (y) without an exception if x or y is NaN.

       islessgreater()
              determines  (x)  <  (y)  || (x) > (y) without an exception if x or y is NaN.
              This macro is not equivalent to x != y because that expression is true if  x
              or y is NaN.

       isunordered()
              is true if x or y is NaN and false otherwise.

NOTE
       Not  all hardware supports these functions, and where it doesn’t, they will be emu-
       lated by macros. This will give you a performance penalty.  Don’t use  these  func-
       tions if NaN is of no concern for you.

CONFORMING TO
       C99

SEE ALSO
       fpclassify(3), isnan(3)



                                  2002-07-27                      ISGREATER(3)

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