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# numerator(+Number, -Result)

Extracts the numerator of the rational Number and unifies the resulting
integer with Result.
*Number*
- An integer or rational number.
*Result*
- Output: integer.

## 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

### Exceptions

*(4) instantiation fault *
- Number is not instantiated (non-coroutining mode only).
*(5) type error *
- Number is a float or breal.
*(24) number expected *
- Number is not of a numeric type.

## Examples

Success:
Result is numerator(3_4). % gives Result = 3
Result is numerator(9_12). % gives Result = 3
Result is numerator(-3_4). % gives Result = -3
Result is numerator(25). % gives Result = 25
Error:
Result is numerator(3.1). % type error

## See Also

is / 2, denominator / 2, rational / 2