8.1.6 Iteration (WHILE … DO … ENDWHILE)

Question 1

What is a WHILE … DO … ENDWHILE loop

Answer 1

• It is a pre-condition-controlled loop.
  
  • The condition is checked at the start of the loop.
  • The code inside the loop may not execute.
  • The loop is executed when the condition becomes false
    Used when you do not know how many time to iterate.

Question 2

WHILE … DO … ENDWHILE loop example

Answer 2

STRING guess = “”

WHILE guess <> “Turing” DO
OUTPUT “What is my name? “
INPUT guess
ENDWHILE

OUTPUT “Alan Turing actually”