How to print out string constant with NSLog on iOS

Question

I have a string constant defined like this:

#define kMyString @"This is my string text!";

Somewhere in the code I would like to print-out this piece of code with NSLog like that:

NSLog(@"This is it: %@",kMyString);

But get a build error: Expected expression.

I have already looked at the Apple's Format Specifiers but could not figured it out.

Can someone please explain it to me how to do this?

Thanks!

score 43 · Accepted Answer · answered Mar 08 '12 at 12:00

43

You should remove ; from the definition of kMyString:

#define kMyString @"This is my string text!"

The way you did it is equivalent to:

NSLog(@"This is it: %@", @"This is my string text!";);

answered Mar 08 '12 at 12:00

sch

I have mistyped in question. But the problem still exists. – Borut Tomazin Mar 08 '12 at 12:07
OMG. Actually I have mistyped also in code. Removed semicolon and now it works. Thanks! – Borut Tomazin Mar 08 '12 at 12:09

score 5 · Answer 2 · answered Jun 24 '14 at 09:18

5

%@ is for objects. BOOL is not an object.
On the bases of data type %@ changes as follows

For Strings you use %@
For int  you use %i
For float you use %f
For double you use %lf

answered Jun 24 '14 at 09:18

Vaibhav Sharma

There are no BOOLs mentioned in this question. – James Webster Sep 08 '15 at 08:29

score 2 · Answer 3 · answered Mar 08 '12 at 12:03

2

Remove that semi colon after #define and use %@ and it will work.

answered Mar 08 '12 at 12:03

Ankit Srivastava

well if you want a string constant you can always use 'extern NSString * const MyFirstConstant;' – Ankit Srivastava Mar 08 '12 at 12:08
refer this link I think this is what you want.. http://stackoverflow.com/a/539191/919545 – Ankit Srivastava Mar 08 '12 at 12:09
I know about that but I prefer #define like constants. BTW I just solved the problem - looked at the answer by @sch – Borut Tomazin Mar 08 '12 at 12:12

3 Answers3