abs(+Number, -Result)

-Result is abs(+Number)

Number

A number.

Result

Output: a number.

Description

Result is the absolute value of Number, and of the same type.

This predicate can be used as a function in arithmetic expressions. In coroutining mode, if Number is uninstantiated, the call to abs/2 is delayed until this variable is instantiated.

Modes and Determinism

• abs(+, -) is det

Exceptions

(4) instantiation fault

Number is not instantiated (non-coroutining mode only).

(24) number expected

Number is not of a numeric type.

Examples

    Result is abs(1).		% gives Result = 1
    Result is abs(-5).		% gives Result = 5
    Result is abs(-6.2).	% gives Result = 6.2

    Result is abs(-0.6__-0.5).	% gives Result = 0.5__0.6
    Result is abs(-0.2__0.1).	% gives Result = 0.0__0.2

See Also