On Oct 5, 2010, at 02:48, Derek Huby wrote:
> This method isn't doing what I expect it to do (which probably means that I'm
> expecting the wrong thing.)
>
> //=====================================================
> NSRange range = NSMakeRange(0,1);
>
> NSString *s1 = @"ab";
> NSString *s2 = @"ac";
>
> //Just compare the first character
> NSComparisonResult result1 = [s1 compare:s2 options:NSLiteralSearch
> range:range locale:[NSLocale currentLocale]];
> NSLog(@"Result 1 = %d", result1);
>
> //Now swap the order of the strings
> NSComparisonResult result2 = [s2 compare:s1 options:NSLiteralSearch
> range:range locale:[NSLocale currentLocale]];
> NSLog(@"Result 2 = %d", result2);
> //=====================================================
>
> I get a result of -1 both times. Since we are only comparing the first
> character, shouldn't the result be 0?
Your pairing of NSComparisonResult (which is typedef'ed to NSInteger) with
string format specifier %d is incorrect and will fail under a 64-bit
architecture (although I don't see how it would produce the -1 result -- but
the above probably isn't your real code anyway, is it?). The generally
recommended idiom is:
NSLog(@"Result 1 = %ld", (long) result1);
FWIW
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