Symbols in Obj-C

Question

What are all of the symbols in obj-c? Like %@, %d, etc. What do they all mean? Thanks

Answer 1

They are called Format Specifiers.

Answer 2

%@ and %d are format specifiers.

• see also http://www.opengroup.org/onlinepubs/009695399/functions/printf.html

NSString supports the format characters defined for the ANSI C function printf(), plus @ for any object. If the object responds to the descriptionWithLocale: message, NSString sends that message to retrieve the text representation, otherwise, it sends a description message.

See also: Apple Documentation – FormatStrings.html

Answer 3

The best response is in the Mac Os X Refrence library.

The big difference between C and Objective C is the %@ symbols. The %@ print as string the return of descriptionWithLocale of an object if available.