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Programming concepts

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Question 47

The two subroutines Figure 1 and Figure 2 are designed to calculate the sum of numbers from n n\,n down to 1.

Figure 1

SUBROUTINE sumValues(n)
  total ← 0
  WHILE n > 0
    total ← total + n
    n ← n - 1
  ENDWHILE
  OUTPUT total
ENDSUBROUTINE

Figure 2

SUBROUTINE sumValues(n)
  total ← 0
  REPEAT
    total ← total + n
    n ← n - 1
  UNTIL n ≤ 0
  OUTPUT total
ENDSUBROUTINE

Describe two differences in the way the loops in Figure 1 and Figure 2 operate.

[3]
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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