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Computer Science IGCSEPDF 104
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8.1.3 Iteration
Count-controlled loops:
With WHILE loop:
Count ← 1 //initialise counter variable
WHILE Count <= 10 DO
Pre-condition loops:
Post-condition loops:
● Itis alsoused when the number of repetitions is unknown.
● The condition is tested after the statements are executed once.
● The statements are always executed once.
● They areused when a known number of repetitions are required.
● In this loop, the counter is incremented automatically.
● Itis usedwhen the number of repetitions is not known.
● The condition is tested before the statements are executed.
● The statements may not be executed at all if the condition is evaluated as false.
WHILE <condition>
<statement(s)>
ENDWHILE
REPEAT
<statement(s)>
UNTIL <condition>
OUTPUT "Please enter a name"
FOR <identifier> ← <value1> TO <value2>
<statement(s)>
NEXT <identifier>