Interview Question

Software Engineer New Grad Interview


Visa Inc.

How to swap two variables without a temp

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3 Answers


a=a^b b=a^b a=a^b

Tony on


a=a +b b=a - b a= a- b

Anonymous on


What if the variable is big. like the max value of an integer. How do we do this without changing it to long (which is easy but obviously not the solution) use bitwise operations. a=3 b=4 a = a xor b xor a b = a xor b xor b

sandy on

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