Question

NSLog(@"testString: %@", testString);

P.S. the second testString is a pointer to a NSString.

I found the above in a tutorial, and it says (%@ means an Objective-C object).

So, what does the first @ do?

Answer 1

@”” just means a string declaration in objective-c.

e.g.

 [myObject setString:@"my string"];

or

 NSString *myString = [NSString stringWithString:@"the second String"];
 [myObject setString:myString];

So in NSLog you are saying..

NSLog .. this string @” text ” .. the %@ pointer links to things outside the string after the commar.

E.g.

 NSLog(@"String 1 : %@ , String 2 : %@", string1, string2);