OpenEuphoria

Re: problems with the scoping in eu4

• Posted by mattlewis (admin) Jan 09, 2011
• 1642 views

while start with entry do 
	integer start 
	... 
entry 
	start = ... 
end while 

while 1 do 
	integer start 
	... 
	if not start then exit end if 
	start = ... 

I'm not sure what that point would be. Are there languages where the first example would be expected to work? What would it do? What if you declared a variable named start previously? Which start would you expect to use?

The problem with the first example is that it's using a variable outside of its scope. I'm sure we'd all expect this to fail:

procedure my_loop() 
    integer start 
    while start do 
        .... 
    end while 
end procedure 
my_loop() 
if start then 
    .... 
end if 

I don't see the difference. I suppose euphoria's use of then/do..end instead of curly braces is confusing people about how scopes work. But if you saw (warning, C code ahead):

while( start ) 
{ 
    int start 
    ... 
    if( !start ) break; 
    ... 
} 

...it's pretty obvious that the start in the while condition is not the same start as one inside the block of code for the loop.

Matt