Str procedure

  DECLARATION:  Str(X [: width [: decimals]], Var S : String);

      PURPOSE:  Converts a numeric value to its string representation

         UNIT:  System

      REMARKS:  X must be a Integer- or Real-type expression.  Width and
                Decimal are optional integer expressions.  S is a string
                variable.

                Str converts X to its string representation optionally using
                the Width and Decimal parameters.  This works the same as
                the Write command except that the value is stored into a
                string variable instead of a text file (or standard output).