Re: How to add a -(unsigned long long)unsignedLongLongValue method to NSString
Re: How to add a -(unsigned long long)unsignedLongLongValue method to NSString
- Subject: Re: How to add a -(unsigned long long)unsignedLongLongValue method to NSString
- From: Ken Thomases <email@hidden>
- Date: Sun, 11 Jan 2009 01:50:44 -0600
On Jan 11, 2009, at 1:28 AM, email@hidden wrote:
If you must work character-by-character,
use character constants (e.g. >'0' or '9')
In that (unlikely) situation, how would I test, say, equality
of characters ? For example, if I needed to know whether
character number j in aString is '7', writing
([aString characterAtIndex:j]=='7') wouldn't work, would it ?
Sure it would. Both unichar (as typedef'd) and char are integer types
in C. '7' is another way of writing a number, although not the number
7. Which number depends on the encoding of your source file, but in
most modern systems it would be ASCII or UTF-8. (I don't know if, for
example, EBCDIC is still used on any modern systems.) In either of
those, '7' is the same as 0x37 or 55.
Cheers,
Ken
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