Changes

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The Objective-C ''for'' loop described previously works well when you know in advance how many times a particular task needs to be repeated in a program. There will, however, be instances where code needs to be repeated until a certain condition is met, with no way of knowing in advance how many repetitions are going to be needed to meet that criteria. To address this need, Objective-C provides the ''while'' loop (yet another construct inherited by Objective-C from the C Programming Language).

i = 20

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