What's the difference between single and double quotes in Objective-C?

Posted by Alex Mcp on Stack Overflow See other posts from Stack Overflow or by Alex Mcp
Published on 2010-06-06T00:57:19Z Indexed on 2010/06/06 1:02 UTC
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objective-c

I'm working through a book exercise to generate some random serial number, and here's my function:

NSString *randomSerialNumber = [NSString stringWithFormat:@"%c%c%c%c%c",
                                    '0' + random() % 10,
                                    'A' + random() % 26,
                                    '0' + random() % 10,
                                    'A' + random() % 26,
                                    '0' + random() % 10];

This works and has an output like: 2J6X7. But before, the 0s and As I had wrapped in double quotes, and an example output was 11764iÒ˜. What did I do wrong my first time around, and why did using single quotes fix it?

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What's the difference between single and double quotes in Objective-C? - Developer IT

What's the difference between single and double quotes in Objective-C?

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