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Algorithms (loops)

1. Algorithms (loops)

Consider the algorithm fragment. REPEAT DoThis UNTIL x<=5 OR y=8 Which of the following is logically equivalent?

  1. DoThis WHILE x>5 AND Y< >8 DoThis ENDWHILE
  2. DoThis WHILE x<=5 AND y=8 DoThis ENDWHILE
  3. DoThis WHILE x<=5 OR y=8 DoThis ENDWHILE
  4. DoThis WHILE x>5 OR Y< >8 DoThis ENDWHILE
Answer

A

NESA answer key: A. REPEAT ... UNTIL (x<=5 OR y=8) continues while NOT(x<=5 OR y=8) = x>5 AND y<>8, and the body runs at least once. Old syllabus (SDD): useful as overlap practice only.