ruby [ 구구단 ]

for number1 in 2..9 # 2,3,4, ..., 9
  for number2 in 1..9 # 1,2,3,4, ..., 9
    printf("%2d x %2d = %2d\t", number1, number2, number1*number2)
    if (number2 == 9)
      printf("\n")
    end
  end
end