help2002

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help2002

This forum is provided to promote discussion amongst students enrolled in CITS2002 Systems Programming.
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UWA week 36 (2nd semester, mid-semester break) ↓

1st project Function Identifiers as Arguments (all 5)

8:48am Tue 3rd Sep, Daniel J.

If we pass a function into another function as an argument, is it expected that we can call it, or should it be treated as an un-declared variable, ie 0?

function add a b
    return a + b()

function two
    return 2

print add 1 two

Should this produce 3, or should this be a syntax error (cannot call literal)?

1st project Function Identifiers as Arguments (all 5)

8:51am Tue 3rd Sep, Daniel J.

For clarification, it should be print add(1, two) I should read things more carefully.

1st project Function Identifiers as Arguments (all 5)

12:56pm Tue 3rd Sep, Mark LN.

Instead of passing a function to another function, the first function can just be evaluated in the parameter expression like this:

function add a b
	return a + b
#
function two
	return 2
#
print add(1, two())

1st project Function Identifiers as Arguments (all 5)

1:51pm Tue 3rd Sep, Daniel J.

Thanks, I understand that is an option, but I do want to know whether the language actually permits passing references to functions, because the syntax guide suggests it does, and the language description doesn't seem to forbid it.

1st project Function Identifiers as Arguments (all 5)

8:38pm Tue 3rd Sep, Mark LN.

Yup sure - now you got me thinking about adding that as well! Shouldn't be too hard I guess...