Argument

expression

   The integer or string expression to be evaluated.

   If you specify an integer expression, the F$STRING function
   evaluates the expression, converts the resulting integer to
   a string, and returns the result. If you specify a string
   expression, the F$STRING function evaluates the expression and
   returns the result.

   When converting an integer to a string, the F$STRING function
   uses decimal representation and omits leading zeros. When
   converting a negative integer, the F$STRING function places a
   minus sign at the beginning string representation of the integer.