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You'll need 3 variables for this, here's a pseudo code for swapping values of 2 variables.

ALGORITHM SWAP

var1 = 10

var2 = 20

temp = 0

temp = var1 "temp = 10"

var1 = var2 "var1 = 20, originally 10"

var2 = temp "var2 = 10, originally 20"

END SWAP

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Q: Program designed to swap the values of two variables?
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