>hi, about the paramenters
>it assumes that is numeric , but how about strings, how do i pass string parameters?

Exactly the same. Only the recommended naming system changes.

For a numeric:

Local variable: lnVar

Private variable: pnVar

Public variable: gnVar && You should almost never use public variables

Parameter: tnVar (or rnVar, according to some)

For a character:

Local variable: lcVar

Private variable: pcVar

Global variable: gcVar

Parameter: tcVar


For other types: The second character will be "d" for date, "t" for date-time, "l" for logical, "u" or "x" if the type is variable, "a" for an array.