O-LevelComputer ScienceAlgorithm design and problem-solving2210/22 · May/June 2016 · Q26 Marks
Read this section of program code that inputs 10 positive numbers and then outputs the total. 1 Total = 0 2 Counter = 0 3 REPEAT 4 INPUT Num 5 Total = Total + Num 6 PRINT Total 7 Counter = Counter + 1 8 UNTIL Counter = 10 This code works, but it is inefficient.
- (i)Suggest three improvements that could be made.[3]
- (ii)Rewrite the program code with your improvements.[3]
Mark scheme
Marking points from the official mark scheme (May/June 2016). The mark or mark type is shown in brackets.
- [1] use FOR ... NEXT instead of REPEAT ... UNTIL
- [1] Move PRINT to after the end of the loop
- [1] Add error checking to check that the value input is positive
- [1] Total = 0
- [1] FOR Counter = 1 TO 10
- [1] REPEAT INPUT Num UNTIL Num >0
- [1] Total = Total + Num
- [1] NEXT Counter
- [1] PRINT Total
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