In all the loops you have solved so far, you knew the number of iterations. Sometimes, you do not know it when writing a program, simply because the user is supposed to enter it. However, in all the cases, when a loop started, it had already been determined how many times it would iterate.
Sometimes, the number of repetitions is not known at the moment a loop starts executing. Frequently, you will be concerned with the question of whether a loop should go on or terminate.
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