Using NSLog for debugging
Try this piece of code:
NSString *digit = [[sender titlelabel] text];NSLog(@"%@", digit);The message means that you have incorrect syntax for using the digit variable. If you're not sending it any message - you don't need any brackets.
Use NSLog() like this:
NSLog(@"The code runs through here!");Or like this - with placeholders:
float aFloat = 5.34245;NSLog(@"This is my float: %f \n\nAnd here again: %.2f", aFloat, aFloat);In NSLog() you can use it like + (id)stringWithFormat:(NSString *)format, ...
float aFloat = 5.34245;NSString *aString = [NSString stringWithFormat:@"This is my float: %f \n\nAnd here again: %.2f", aFloat, aFloat];You can add other placeholders, too:
float aFloat = 5.34245;int aInteger = 3;NSString *aString = @"A string";NSLog(@"This is my float: %f \n\nAnd here is my integer: %i \n\nAnd finally my string: %@", aFloat, aInteger, aString);
Why do you have the brackets around digit?It should be
NSLog("%@", digit);
You're also missing an = in the first line...
NSString *digit = [[sender titlelabel] text];