Computer Science · Oct / Nov 2016 · Paper 23 · Question 5
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REPEAT ... UNTIL and WHILE ... DO ... ENDWHILE are two different loop structures you can use when writing pseudocode. Explain, using examples, why you would choose to use each type of loop. Example 1 Reason for choice Example 2 Reason for choice [6]
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For each example 1 mark for correct structure, 1 mark for appropriate content inside loop and 1 mark for reason. There are many correct answers these are only samples REPEAT ..INPUT Number Total ← Total + Number UNTIL Number = 0 – at least one repeat is required WHILE Number <> -1 DO ..INPUT Number Total ← Total + Number ENDWHILE – the loop may never be executed [6]
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