Honors Software Design - iOS                                                                    Name -
Learn Objective-C in 6 Days Worksheet #3

Answer the following after reading http://mobile.tutsplus.com/tutorials/iphone/learn-objective-c-day-3/

1. What does the abbreviation "NS" stand for?

2. List five simple, common classes that are specific to Objective-C since they are named with the "NS" prefix.

3. What is the difference between immutable and mutable?

4. What is the difference between the single statement

NSString *testString;

and the two statements

NSString *testString;
testString = [[NSString alloc] init];






5. What is the purpose of the method init?

6. What does the @ indicate in the statement      testString = @"Here's a test string in testString!";








7. Why is    return 0;      added as the last statement in a program?

8. What class is a child of NSString?




9. What class is a child of NSObject and a parent of NSMutableString?

10. What important method does NSString inherit from NSObject?