[Year 12 SofDev] Help needed

[John Schwartz]

Surely the total depends on the values of redvalue and greenvalue which
aren't given. As it stands, only greenvalue would be used as you would
skip the second loop.

 

John

 

From: Brett Groves [mailto:groves.brett.g at edumail.vic.gov.au] 
Sent: Wednesday, 25 May 2011 11:43 AM
To: Year 12 Software Development Teachers' Mailing List
Subject: [Year 12 SofDev] Help needed

 

Hi all,

Wondering if some kind soul who is good with desk checks / pseudo code
can help me out here. We are about to commence OC2 (running a week late)
and I have given my students some algorithms to evaluate for revision.
On one in particular I realised I made an error of logic when
evaluatiing it myself and have now confused my self to point of
frustration. It's the one below. It has two count loops which it uses to
select data in an array but they both have identical conditions. As I am
currently reading it values will never be passed to the second loop as
the evaluation condition that ends the first loop will also end the
second???? Scratches head......sure I'm failing to see obvious! Can
anyone help pls

Brett

Question 12:

The following diagram shows the contents of an array of records used for
mixing colours.

The name of the array is 'COLOUR'.

The algorithm below is used to calculate colour values, using an array. 

BEGIN

SET TOTAL TO 0

SET COUNTER TO 1

WHILE COUNTER < 4

TOTAL = TOTAL + COLOUR [COUNTER] . GREENVALUE

ADD 1 TO COUNTER

ENDWHILE

WHILE COUNTER < 4

TOTAL = TOTAL + COLOUR [COUNTER] . REDVALUE

ADD 1 TO COUNTER

ENDWHILE

PRINT TOTAL

END

 

What will be the output of this algorithm?

(A) 10

(B) 11

(C) 18

(D) 25

 

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John Schwartz
Parade College
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