On Jan 2, 2011, at 6:10 PM, Stephen J. Butler wrote:

> - Charles asks 'why the @""' and I can answer that question: because
> you couldn't figure out another way to call stringByAppendingFormat:
> could you? The answer is that in this case you should be calling
> +[NSString stringWithFormat:]. However...

Ah — my assumption was that he wanted to keep appending previous results to the 
string, so it’d create sort of a log file sort of thing (or, since his object 
is a calculator, something akin to a roll of tape on an adding machine). In 
this case, using -stringByAppendingString: (or just using an NSMutableString) 
would be correct, although the assignment to an empty string would be wrong.

Charles_______________________________________________

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