
numerator(+Number, -Result)

   Extracts the numerator of the rational Number and unifies the resulting
integer with Result.



Arguments
   Number              An integer or rational number.
   Result              A variable or integer.

Type
   Arithmetic

Description
   This predicate is used by the ECLiPSe compiler to expand evaluable
   arithmetic expressions.  So the call to numerator(Number, Result) is
   equivalent to

    Result is numerator(Number)

   which should be preferred.

   In coroutining mode, if Number is uninstantiated, the call to
   numerator/2 is delayed until this variable is instantiated.




Modes and Determinism
   numerator(+, -) is det

Exceptions
     4 --- Number is not instantiated (non-coroutining mode only).
     5 --- Number is a float or breal.
     5 --- Result is a number but not an integer.
    24 --- Number is not of a numeric type.
    24 --- Result is neither a number nor a variable.

Examples
   
Success:
      numerator(3_4, 3).
      numerator(9_12, 3).
      numerator(-3_4, -3).
      numerator(25, 25).
Fail:
      numerator(3_4, 4).
Error:
      numerator(A, 3).                     (Error 4).
      numerator(3.1, 3).                   (Error 5).
      numerator(3_4, 3_1).                 (Error 5).
      numerator(3_4, r).                   (Error 24).
      numerator(1_3 + 3_4, 13).            (Error 24).





See Also
   is / 2, denominator / 2, rational / 2
