Understanding scope of variables

[georgeo]

Actually, my question is more related to subroutines than functions. So, is the following code valid:

Code:

sub myFunction( byref total as uinteger, name$ as string )
    dim length, n as ubyte

    length = len(name$)

    if length=0 then
    return
    end if

    for n = 0 to length-1
    total = total + code(name$(n))
    next n
   
    return
end sub

REM Main program
dim n as ubyte
dim total as uinteger

n = 14
myFunction(total, "Hello")

print "Answer = " + str$(total)
print "n = " + str$(n)

stop

---with variables labelled 'n' in both the main program and the subroutine.

Thanks again