function and sub declaration |
Declaration of functions and subs are similar to basic. In functions to return function values, use implicit declared variable which has the same name of the function, or use Return statement. Parameters by reference can also be used, using BYREF directive.
Some examples:
SUB HelloWord
ShowMessage("Hello world!")
END SUB
SUB UpcaseMessage(Msg)
ShowMessage(Uppercase(Msg))
END SUB
FUNCTION TodayAsString
TodayAsString = DateToStr(Date)
END FUNCTION
FUNCTION Max(A,B)
IF A>B THEN
MAX = A
ELSE
MAX = B
END IF
END FUNCTION
SUB SwapValues(BYREF A, B)
DIM TEMP
TEMP = A
A = B
B = TEMP
END SUB
You can also declare subs and functions as private or public using the following syntax:
PRIVATE SUB Hello
END SUB
PUBLIC FUNCTION Hello
END FUNCTION
Subs and functions are public by default.
You can use Return statement to exit subs and functions. For functions, you can also return a valid value.
Examples:
SUB UpcaseMessage(Msg) ShowMessage(Uppercase(Msg))
Return
'This line will be never reached
ShowMessage("never displayed")
END SUB
FUNCTION TodayAsString
Return DateToStr(Date)
END FUNCTION
