Swapping two variables in ruby

swap_two_variables.rb

#Swapping two variables in ruby :
#
# $ ruby swap_two_variables.rb
# Enter first variable :
# 2
# Enter second variable :
# 3
# After exchanging the value :
# the value of a is :3
# the value of b is :2
# the value of a is :2
# the value of b is :3
# the value of a is :3
# the value of b is :2

puts "Enter first variable :"
a = gets.to_i
puts "Enter second variable :"
b = gets.to_i

puts "the value of a is :#{a}"
puts "the value of b is :#{b}"

puts "After exchanging the value :"

# Ist method

a,b = b,a
puts "the value of a is :#{a}"
puts "the value of b is :#{b}"

#2nd method using temperory variable

c = a
a = b
b = c
puts "the value of a is :#{a}"
puts "the value of b is :#{b}"

#3rd method using arithmetic operation

a = a+b 
b = a-b
a = a-b
puts "the value of a is :#{a}"
puts "the value of b is :#{b}"