The two subroutines below, Figure 1 and Figure 2, are designed to count how many times a number must be doubled before it reaches or exceeds a target limit.
Figure 1
SUBROUTINE double_limit(val, limit)
count ← 0
REPEAT
val ← val * 2
count ← count + 1
UNTIL val >= limit
RETURN count
ENDSUBROUTINE
Figure 2
SUBROUTINE double_limit(val, limit)
count ← 0
WHILE val < limit
val ← val * 2
count ← count + 1
ENDWHILE
RETURN count
ENDSUBROUTINE
Describe two differences in the way the loops in Figure 1 and Figure 2 operate.
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.