Expected while?

[Mikey2520]

What is this, I got while, "(" and "{", but it's still saying it's wrong..

[ivant]

You're probably missing a close parentheses of some sort before this line.

[ybakos]

I could be mistaken but I believe you'll need to group the terms in that boolean expression, eg:

while ((a~=dx) | (b ~= dy)) {

[cadet1620]

"~=" is not a valid token in Jack. (There are no two character tokens except // /* and */.)

You need to code "not equals" as ~(a=dx).

Also, remember that there is no defined order of operation, so you need to fully parenthesize complex expressions.

    while ( (~(a=dx)) | (~(b=dx)) )

Whitespace can really aid readability of Jack expressions!

--Mark

[ybakos]

Ah, that was it. Clearly I need a refresher!