Computer Science · Oct / Nov 2016 · Paper 22 · Question 2
2210
As printed in the paper
The question as text
Read this section of program code that inputs positive numbers, discards any negative numbers and then outputs the average. An input of zero ends the process. 1 Total = 0 2 Counter = 100 3 REPEAT 4 REPEAT 5 INPUT Num 6 UNTIL Num < 0 7 Total = Total + 1 8 Counter = Counter + Num 9 UNTIL Num = 0 10 Average = Total / (Counter - 1) 11 Print Average There are four errors in this code. Locate these errors and suggest a correction to remove each error. Error 1 Correction Error 2 Correction Error 3 Correction Error 4 Correction [8]
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Show the answer and mark scheme
1 mark for identifying each error, 1 mark for the corresponding change – line 2 or Counter = 100 – Counter = 0 – line 6 or UNTIL Num < 0 – UNTIL Num >= 0 – line 7 or Total = Total + 1 – Total = Total + Num – line 8 or Counter = Counter + Num – Counter = Counter + 1 [8]
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