LinkedIn Objective-C

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What is this code an example of?

[self addObserver:self forKeyPath:@"val" options:0 context:nil];

• Key-Value Observing
• KeyPath Observing
• Class Value Observing
• Key-Data Observing

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What does ARC stand for?

• Automatic Release Code
• Automatic Reference Counting
• Automatic Retain Checking
• Async Retain Cycles

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What is printed for this code?

int val = 0;

 val = 1.5;

 printf ("%d", val);

• 2
• This code contains an error.
• 1
• 0

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What best describes class inheritance in Objective-C?

• Objective-C doesn't support inheritance.
• dual class inheritance
• unlimited class inheritance and protocol adherence
• single inheritance but multiple protocol implementation

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How many keys does this NSDictionary have after this code is executed?

NSDictionary *dict = [[NSDictionary alloc] initWithObjectsAndKeys:

  @"b",@"e",@"a",@"r", nil];

• 4
• This code contains an error.
• 2
• 5