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) ↓

1st project Questions about project 1 (all 7)

1:46am Sun 25th Aug, Yuxuan Y.

Hi, Professor. I have some questions about project 1. Should we consider about nested function and higher-order function?

function create_multiplier factor
	function multiplier x
		return x * factor
	return multiplier

double <- create_multiplier(2)
print double(5)

function foo x
	function bar y
		print y
	print x

and should we handle the unexpected indent error like

[statement]
	[statement]
[statement]

1st project Questions about project 1 (all 7)

5:04am Sun 25th Aug, Christopher M.

Hello, The project specification is not quite finished, yet, but ... "Yuxuan Yuan" <24*8*8*3@s*u*e*t*u*a*e*u*a*> wrote:

> Should we consider about nested function and higher-order function?

The language's syntax does not permit nested functions: [CITS2002]⬈ Functions are introduced with the 'function' keyword, which only appears at the program's global level, and not as a type of statement.

> and should we handle the unexpected indent error like > ``` > [statement] > [statement] > [statement] > ```

Whitespace is insignificant, everywhere, except for when a single tab shows that a statement belongs to a function body. So the above is OK.

UWA week 35 (2nd semester, week 6) ↓

1st project Questions about project 1 (all 7)

4:22am Mon 26th Aug, Christopher M.

"Yuxuan Yuan" <24*8*8*3@s*u*e*t*u*a*e*u*a*> wrote:

> and should we handle the unexpected indent error like > ``` > [statement] > [statement] > [statement] > ```

Very sorry, but I'm going to reverse my decision on this point (to make it easier for all to implement): All statements and function prototypes (1st line) must begin at the left-hand-margin (column 1). The statements forming a function's body must be indented with a single tab-character. So, your above example should be flagged as having an invalid/unrecognised middle line. Please reply if this is unclear!

UWA week 36 (2nd semester, mid-semester break) ↓

1st project Questions about project 1 (all 7)

1:22am Thu 5th Sep, ANONYMOUS

Hi, Does this mean whitespace is only significant when it is at the beginning of a line but still insignificant anywhere else (except when 1 whitespace minimum is necessary)? Therefore, any line beginning with a whitespace would cause an error (including before a tab character), but additional whitespace throughout a line is fine. Or does this mean all additional whitespaces should be a cause for error? Thank you for clarifying!

1st project Questions about project 1 (all 7)

9:22pm Thu 5th Sep, Joshua N.

ANONYMOUS wrote:

> Hi, > > Does this mean whitespace is only significant when it is at the beginning of a line but still insignificant anywhere else (except when 1 whitespace minimum is necessary)? Therefore, any line beginning with a whitespace would cause an error (including before a tab character), but additional whitespace throughout a line is fine. > > Or does this mean all additional whitespaces should be a cause for error? > > Thank you for clarifying!

Hi question is answered here: [help2002]⬈

UWA week 37 (2nd semester, week 7) ↓

1st project Questions about project 1 (all 7)

6:45pm Wed 11th Sep, ANONYMOUS

I apologise for repeatedly asking, but I still need a more specific clarification regarding this case. The line 'Whitespace can only appear at the beginning of a line if it is a tab under a function definition' is said to be true but whitespace and tab are not the same, so it is a bit confusing to me. Assuming that line only means the tab character '\t', I am under the impression that any line beginning with whitespace would cause an error, please let me know if I am misunderstanding.

1st project Questions about project 1 (all 7)

10:43pm Thu 12th Sep, Joshua N.

ANONYMOUS wrote:

> I apologise for repeatedly asking, but I still need a more specific clarification regarding this case. The line 'Whitespace can only appear at the beginning of a line if it is a tab under a function definition' is said to be true but whitespace and tab are not the same, so it is a bit confusing to me. Assuming that line only means the tab character '\t', I am under the impression that any line beginning with whitespace would cause an error, please let me know if I am misunderstanding.

Tabs are a form of white space. More detail given here: [help2002]⬈