Comments on: Guess the bug!

By: Chuck

Chuck — Sun, 01 Apr 2007 19:29:52 +0000

And this, children, is why we should never use the comma operator. It is a siren trying to lure you in with her arcane, 1337-looking song.

By: Evan Schoenberg

Evan Schoenberg — Sun, 01 Apr 2007 02:05:58 +0000

s/pretty/pretty sure/
Though I'm also pretty, I'm not pretty nothing.

By: Evan Schoenberg

Evan Schoenberg — Sun, 01 Apr 2007 02:05:27 +0000

I'm pretty nothing - not even funny thing here which has very low precedence - is lower on the order of events than a comma. :)

By: Peter Hosey

Peter Hosey — Sun, 01 Apr 2007 00:25:27 +0000

Heh, you're right. I thought that the comma would take precedence, and a would get 100. Silly me. :)

By: Evan Schoenberg

Evan Schoenberg — Sat, 31 Mar 2007 23:58:43 +0000

What were you trying to do? If all you want to do is assign 42 to 'a' and 100 to 'b', it's fine, though weird, isn't it? Now, if you wanted to check the return value, you'd find that the second statement's return value was relevant, so:
if ((a = 42, b = 100) == 42) {
NSLog(@"a");
} else if ((a = 42, b = 100) == 100) {
NSLog(@"b");
} else {
NSLog(@"%i",(a = 42, b = 100));
}
will output "b".