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Question 56

Two different version of a subroutine designed to scale a starting integer n n\,n by repeatedly multiplying it by 3 until it exceeds 100 are shown in the pseudocode below.

Subroutine A

SUBROUTINE scale(n)
  a ← n
  count ← 0
  REPEAT
    a ← a * 3
    count ← count + 1
  UNTIL a > 100
  OUTPUT count
ENDSUBROUTINE

Subroutine B

SUBROUTINE scale(n)
  a ← n
  count ← 0
  WHILE a <= 100
    a ← a * 3
    count ← count + 1
  ENDWHILE
  OUTPUT count
ENDSUBROUTINE

Describe two differences in the way the loops in Subroutine A and Subroutine B execute.

[2]
Markscheme

Programming concepts Questions

  1. GCSE
  2. /Computer Science
  3. /Programming concepts

298 exam-style questions on AQA GCSE Computer Science Programming concepts. Each one has a worked solution and a mark scheme showing where the marks go.

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