
Lite 
Variable Switch
Category:  Logic 
Submitted By:  rob77 
Fun:  (1.97) 
Difficulty:  (2.31) 
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=BA to assign a new value to B.
Hint:
You can do it in three steps.
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