MT4 programming and the "return" code

Hello Folks,

I'm playing a bit the MT4 programming and I have a hard time understanding when and where to use which "return" function.
I really tried to find explanations everywhere, but it seems it's all not clarifying the issue for me...

some examples:

Can anybody please tell me what to use when and when not...?
Are there more than the three return function variations available than the ones above?

Thanks.
MikeFT

If your function returns a void data type, then you use a return operator


If the function returns a specific data type, then you'd pass the value back from that function using return()


e.g return(543) or return(x+y) or return(variable)

Thank you.
I guess I got it now - at least somewhat.

I think also in an indicator or ea if your start function expects a return( like int start() ) then using a return(-1) kills it - there are return code values somewhere in help for the major functions. For your own functions, the return value can mean whatever you assign to it, like (1)=trendUP, (-1)=trendDOWN, 0=flat, or whatever.