phython3 - calss name is "calculation", Four arithmetic operations in an object-oriented method

calculation's use Passing parameters (10,20) when creating an instance of calculation

use getAdd(), getSub(), getMul(), getDiv() input()

result ==>>

input the first number : <<10

input the first number : <<20

10+ 20 = 30

10*20 = 200

10 - 20 = -10

10 / 20 = 0.5