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Variable Switch

Category:Logic
Submitted By:rob77
Fun:** (1.88)
Difficulty:*** (2.29)



You're a computer programmer, and the program you're writing has numeric variables A and B. You need the computer to switch the variables so that the number in variable A becomes variable B, and the number in variable B becomes variable A. Adding a third variable would use more memory though, so how can you do that switch without using another variable? Use commands such as B=B-A to assign a new value to B.

Hint:

You can do it in three steps.

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