
sqrt(+Number, -Result)

   Evaluates the square root sqrt(Number) and unifies the resulting value with
Result.



Arguments
   Number              A number.
   Result              Output: float or breal.

Type
   Arithmetic

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

    Result is sqrt(Number)

    which should be preferred for portability.

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




Modes and Determinism
   sqrt(+, -) is det

Exceptions
     4 --- Number is not instantiated (non-coroutining mode only).
    24 --- Number is not of a numeric type.
    20 --- Illegal arithmetic operation:  Number is negative.

Examples
   
Success:
    Result is sqrt(2.0).	% gives Result = 1.4142135623730951
    Result is sqrt(1.0).      	% gives Result = 1.0
    Result is sqrt(49).       	% gives Result = 7.0

Error:
    Result is sqrt(-2).         % arithmetic exception


See Also
   is / 2
