Quick quiz on Objective-C

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Stephen Gilmore

A quick quiz to point out some of the differences between Objective-C and Java.

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Computer Science Large Practical:

Quick quiz on Objective-C

Stephen Gilmore

School of Informatics

Friday 19th October, 2012

Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 1 / 15

Question: Does this program print Yes, No or neither?

Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 2 / 15

Answer: it prints Yes.

. . . it prints Yes.

Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 3 / 15

Answer: it prints No.

. . . it prints No.

Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 5 / 15

Answer: neither, it throws an exception.

. . . neither, it throws an exception.

Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 7 / 15

Answer: it prints No.

. . . it prints No.

Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 9 / 15

Answer: it prints No, because we are using pointer equality

. . . it prints No, because we are using pointer equality

Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 11 / 15

Answer: it prints Yes, because we are using content
equality

. . . it prints Yes, because we are using content equality

Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 13 / 15

Answer: neither, it throws an exception because we forgot
to call init

. . . neither, it throws an exception because we forgot to call init

Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 15 / 15

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Quick quiz on Objective-C

1. Computer Science Large Practical: Quick quiz on Objective-C Stephen Gilmore School of Informatics Friday 19th October, 2012 Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 1 / 15

2. Question: Does this program print Yes, No or neither? Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 2 / 15

3. Answer: it prints Yes. . . . it prints Yes. Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 3 / 15

4. Question: Does this program print Yes, No or neither? Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 4 / 15

5. Answer: it prints No. . . . it prints No. Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 5 / 15

6. Question: Does this program print Yes, No or neither? Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 6 / 15

7. Answer: neither, it throws an exception. . . . neither, it throws an exception. Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 7 / 15

8. Question: Does this program print Yes, No or neither? Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 8 / 15

9. Answer: it prints No. . . . it prints No. Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 9 / 15

10. Question: Does this program print Yes, No or neither? Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 10 / 15

11. Answer: it prints No, because we are using pointer equality . . . it prints No, because we are using pointer equality Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 11 / 15

12. Question: Does this program print Yes, No or neither? Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 12 / 15

13. Answer: it prints Yes, because we are using content equality . . . it prints Yes, because we are using content equality Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 13 / 15

14. Question: Does this program print Yes, No or neither? Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 14 / 15

15. Answer: neither, it throws an exception because we forgot to call init . . . neither, it throws an exception because we forgot to call init Stephen Gilmore (School of Informatics) Computer Science Large Practical Friday 19th October, 2012 15 / 15

Quick quiz on Objective-C

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Quick quiz on Objective-C