Argument

expression

   Specifies the expression to be evaluated. Specify either an
   integer or a character string expression.

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

   After evaluating a string expression, the F$INTEGER function
   converts the result to an integer in the following way. If
   the resulting string contains characters that form a valid
   integer, the F$INTEGER function returns the integer value. If
   the string contains characters that do not form a valid integer,
   the F$INTEGER function returns the integer 1 if the string begins
   with T, t, Y, or y. The function returns the integer 0 if the
   string begins with any other character.