Intro Programming
Have some students pretend to be robots while other students program them to complete simple tasks to practice debugging and to emphasize the importance of coding precisely.
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Demonstrate swapping variables' values by swapping the contents of two cups full of liquid; you need a third cup to swap the liquids just like you need a third, temporary, variable to swap the values.
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When you write a function, like (foo x), students don’t realize you can put a variable with a name OTHER than x in there, or an actual number.
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