Conditional loops allow code to repeat until a specified condition is met. There are two types: DO...WHILE loops check the condition at the end of the loop, so the code block will execute at least once. REPEAT...UNTIL loops check the condition at the start, so the code block may not execute at all if the condition is initially false. Conditional loops provide flexibility over fixed loops when the number of iterations is unknown.

1. Conditional Loops

2. Conditional Loops
 We may not know in advance how many times a loop
should repeat, so a fixed loop is not always the best
solution.
 Instead we can use a conditional loop to repeat a block of
code until a specific condition is met.
 There are 2 types of conditional loop:
DO…WHILE some condition is true
REPEAT…UNTIL some condition is true

3. Conditional Loops – DO…WHILE

4. Conditional Loops – DO…WHILE

5. Conditional Loops – REPEAT…UNTIL

6. Conditional Loops – REPEAT…UNTIL