puts 'Enter x and y'
x=gets.to_i  # to check errors, use x=Integer(gets)
y=gets.to_i

puts "Sum: #{x+y}",
     "Difference: #{x-y}",
     "Product: #{x*y}",
     "Quotient: #{x/y}",  # truncates towards negative infinity
     "Remainder: #{x%y}", # same sign as second operand
     "Exponentiation: #{x**y}"