Computer Science for IGCSE & O level - Algorithm Design And Problem Solving (Section 13 - No. 34)

In the alarm clock example, which construct is used to ensure the alarm will only go off at the pre-determined time?

FOR...NEXT loop

REPEAT...UNTIL loop

WHILE...DO...ENDWHILE loop and IF statement

CASE OF structure

The combination of a WHILE loop and an IF statement allows the program to check the time and trigger the alarm when necessary.