multiply 2 numbers without X operator

test_multiply.rb

# perform multiplication on 'a' and 'b' without using X operator

def mul(a, b)
  x = 0
  b.times do
    x = x + a
  end
  puts "Multiplication of #{a.to_s} X #{b.to_s} = #{x.to_s}"
end

mul(4, 4)
# output 16