How to swap variables without the use of a temp variable.

Swap.rb

# initial assignment
x = 5
y = 3

# print the values
puts "#{x}, #{y}"

# perform first xor
x = x ^ y

# print new values
puts "#{x}, #{y}"

# perform second xor
y = x ^ y

# print new values
puts "#{x}, #{y}"

# perform third xor
x = x ^ y

# print final (swapped) values
puts "#{x}, #{y}"