December 1999
SD206 : SYSTEMS DESIGN

QUESTION 4

Total Marks: 15 Marks

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SUGGESTED SOLUTIONS
for Question 4

(a)

(i)What are classification codes ?[2 marks ]

(ii)Give one example ofthe application of a classification code.[1 mark ]

(iii)How do classification codes simplify the input process?[1 mark ]

 

[4]
(b)

(i)What are function codes ?[2 marks ]

(ii)Give one example of the application ofa function code.[1 mark ]

 [3]
(c)

Name two circumstances in which cipher codes might be useful.

[2]
(d)

(i)List two types of error which can be detected by use of a check digit.
[2 marks ]

(ii)What is the check digit of 30424 with a modulus of 10 and a 2-1-2 weighting method?[1 mark ]

(iii)What is the check digit of 30424 with a modulus of 10 and a 3-1-3 weighting method?[1 mark ]

(iv)What is the check digit of 30424 with a modulus of 11 and a 2-1-2 weighting method?[1 mark ]

(v)What is the check digit of 30424 with a modulus of 11 and a 3-1-3 weighting method?[1 mark ]

[6]