help2002

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help2002

This forum is provided to promote discussion amongst students enrolled in CITS2002 Systems Programming.
Please consider offering answers and suggestions to help other students! And if you fix a problem by following a suggestion here, it would be great if other interested students could see a short "Great, fixed it!" followup message.

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UWA week 34 (2nd semester, week 5) ↓

mid-semester test Q10 of sample test (all 11)

4:55pm Mon 19th Aug, ANONYMOUS
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N is replaced with "10;" - so the syntax becomes valid.. for(int i=0; i<10; ++i)

mid-semester test Q10 of sample test (all 11)

4:55pm Mon 19th Aug, Christopher M.

ANONYMOUS wrote:

> When you say both your points, are you saying that `for(int i=0 ; i<N ++i){` *is* valid syntax?

It's certainly an error if you correctly perform the textual substitution for N . A couple of students have asked if this is a trick question - not really, misunderstandings about how the preprocessor works are reasonably common.

mid-semester test Q10 of sample test (all 11)

8:13am Wed 21st Aug, ANONYMOUS

How can the answer still be A when line A is valid and line C contains a syntax error?

mid-semester test Q10 of sample test (all 11)

8:15am Wed 21st Aug, Christopher M.

ANONYMOUS wrote:

> How can the answer still be A when line A is valid and line C contains a syntax error?

Line A is not valid, and line C does not contain a syntax error. Cut-paste-compile the code if you need to.

mid-semester test Q10 of sample test (all 11)

1:51pm Wed 21st Aug, ANONYMOUS

Wouldn't this mean that A and B are incorrect. Since we define N as 10; // which includes the semicolon. That means for A, Substitution: char array[10;]; The semicolon causes a syntax error here. For B, int x = 2 * 10;; This results in a double semicolon (;;), which is a syntax error. For C, I think that is okay for the semicolon to be before ++i Thanks!

mid-semester test Q10 of sample test (all 11)

2:01pm Wed 21st Aug, ANONYMOUS
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Not sure if I am correct but the reason why B (int x = 2 * 10;;) is because it would take the second semicolon as an empty statement so it'll be read as int x = 2 * 10; ; which would not affect the program itself but will just look weird and isn't good practice

mid-semester test Q10 of sample test (all 11)

2:21pm Wed 21st Aug, Christopher M.

ANONYMOUS wrote:

> Not sure if I am correct but the reason why B (int x = 2 * 10;;) is because it would take the second semicolon as an empty statement so it'll be read as > int x = 2 * 10; > ; > which would not affect the program itself but will just look weird and isn't good practice

This is the correct reasoning.