Upwork OBJECTIVE-C TEST 2018

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1. What comments are supported in Obj-C?

Answers:

1. // Line comments
2. /* Block comments */
3. # Line comments
4. ; Line comments
5. -[[ block comments ]]

2. What is a protocol?

Answers:

1. A class that uses functions instead of methods
2. A method signature
3. A class signature
4. An interface without an implementation
5. None of the above

3. What is the isa variable in objects?

Answers:

1. Object size
2. Object memory footprint
3. Object class identification
4. Object serial number
5. None of the above

4. In which version of Objective-C did the fast enumeration system appear?

Answers:

1. 2.0
2. 1.5
3. 1.0
4. 3.0

5. What is an IMP?

Answers:

1. A special type used for computation
2. An alias for SEL
3. A preprocessor directive defined to the implementation name
4. The C type of a method implementation pointe
5. None of the above

6. What is the default visibility for instance variables?

Answers:

1. @private
2. @package
3. @public
4. @protected
5. None of the above

7. What type of variable do you need to use to implement singletons?

Answers:

1. static
2. auto
3. const
4. volatile

8. What is a category?

Answers:

1. A namespace
2. A category is a way to add instance variables to a class which already exists
3. A category is a group of classes
4. A category is a way to add methods to a class which already exists
5. None of the above

9. How do you allocate an object?

Answers:

1. MyClass *obj = malloc(sizeof(MyClass));
2. MyClass *obj = [MyClass alloc];
3. MyClass *obj = alloc(MyClass);
4. MyClass *obj = [MyClass new];
5. None of the above

10. Is the following code a correct allocation?

MyClass myObj;

[&myObj aMessage];

Answers:

1. Yes
2. No

11. What is an autoreleased object?

Answers:

1. A C object.
2. A static object.
3. An object that is garbage collected.
4. An object that will be released when the current AutoreleasePool is deallocated.
5. None of the above

12. Which of the following declares a protocol?

Answers:

1. @proto ProtocolName
2. protocol ProtocolName {};
3. @protocol ProtocolName
4. @interface <ProtocolName>
5. @interface ProtocolName::Protocol

13. In which version of Objective-C did the properties system appear?

Answers:

1. 3.0
2. 2.5
3. 2.0
4. 1.5
5. 1.0

14. What is the id type?

Answers:

1. A generic C type that Objective-C uses for an arbitrary object
2. A memory address type
3. A type to hold serialized objects
4. The type used for Classes
5. None of the above

15. When using the garbage collector, which method, that is normally called without the collector, is not called on your objects where they are collected?

Answers:

1. free
2. dealloc
3. destroy
4. uninit

16. Which of the following creates a class that conforms to a protocol?

Answers:

1. @interface ClassName [ProtocolName]
2. @interface ClassName <ProtocolName>
3. @interface ClassName < ProtocolName
4. @interface ClassName::ProtocolName
5. @interface ClassName(ProtocolName)

17. What is a @finally block?

Answers:

1. A block that is executed when the program quits
2. A block that is executed within a dynamic library when it’s unloaded
3. A block of code that is run whenever an exception is thrown or not
4. None of the above

18. What is true regarding @protected?

Answers:

1. The instance variable is accessible within the class that declares it and within classes that inherit it
2. The instance variable is accessible everywhere
3. The instance variable is accessible only within the class that declares it.
4. This is analogous to private_extern for variables and functions. Any code outside the class implementation’s image that tries to use the instance variable will get a link error
5. None of the above

19. A class can conform to only one protocol.

Answers:

1. True
2. False

20. What class specifiers are supported?

Answers:

1. FINAL
2. STATIC
3. FAST
4. ITERATIVE
5. There is no such thing as class specifiers

21. How do you throw an exception?

Answers:

1. Raise Exception
2. @throw exception
3. RAISE exception
4. THROW exception
5. None of the above

22. What is nil?

Answers:

1. The null object
2. The null class
3. It doesn’t exist
4. None of the above

23. What does the following imply?

Worker *ceo = [[Worker alloc] init];

ceo->boss = nil;

Answers:

1. That the ceo object is statically typed
2. That the boss instance variable is declared @protected
3. That the boss instance variable is declared @public
4. That the ceo is in fact a structure
5. This code is not correct

24. Can an exception caught in @catch be re-thrown?

Answers:

1. Yes
2. No

25. What is true regarding @public?

Answers:

1. It doesn’t exist in Objective-C
2. It breaks encapsulation
3. It can be used only on singleton objects
4. None of the above

26. Which of the following is false?

Answers:

1. Method lookup is done at runtime
2. When a method is called, the send is automatically available as the sender variable, like self or supe
3. Messages can be sent to nil
4. Methods in static libraries must be present at link time

27. What can you use to avoid the msgSend function overhead?

Answers:

1. SEL
2. IMP
3. You can’t use anything
4. None of the above

28. What does Obj-C not support?

Answers:

1. Instance variables
2. Class variables
3. Static variables
4. Automatic variables

29. What is not supported in Obj-C?

Answers:

1. Recursive method call
2. Variable argument count to method
3. Byte manipulation
4. Method argument default value
5. None of the above

30. What will be the output of the following code?

static int

a (void)

{

printf (“an”);

return 0;

}

static int

b (void)

{

printf (“bn”);

return 1;

}

static int

c (void)

{

printf (“cn”);

return 2;

}

int

main (int argc, const char *argv[])

{

printf (“%d %d %d”, a (), b (), c ());

return 0;

}

Answers:

1. a b c 0 1 2
2. a b c 2 1 0
3. c b a 0 1 2
4. c b a 2 1 0
5. None of the above

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