Ask students "do you know in advance how many times you'll need to go through the loop?" when deciding between using a for or a while loop, because this is a good rule of thumb for them to use.

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  • This question is a good is a great tool for choosing between for and while loops.
  • Give several small examples of looping problems, and ask the class which loop structure is appropriate, without writing any code. Once you reach a consensus, go back and explicitly write the code in the language you are using.

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Ran Libeskind-Hadas at CSNYC Tip-A-Thon.
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