O-LevelComputer ScienceProgramming2210/22 · Oct/Nov 2016 · Q28 Marks
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 1Error 1 Correction[2]
- Error 2Error 2 Correction[2]
- Error 3Error 3 Correction[2]
- Error 4Error 4 Correction[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2016). The mark or mark type is shown in brackets.
- [8] 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
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