Interface

Define a MathOp interface that has four methods for add, subtract, multiply, and divide. These methods only work with integers.

Implementation

You will write a class that implements MathOp to support arithmetic operations. Each method should have two parameters. The divide method will throw an exception if the divisor is 0.

Write a program that uses the interface and implementation to allow the users to perform some arithmetic.

Sample run (text marked as bold are user inputs):

run:

1)add, 2)sub, 3)multiply, 4) divide, 5) exit:1 Enter operands:2 4 6 1)add, 2)sub, 3)multiply, 4) divide, 5) exit:2 Enter operands:4 2 2 1)add, 2)sub, 3)multiply, 4) divide, 5) exit:3 Enter operands:2 3 6 1)add, 2)sub, 3)multiply, 4) divide, 5) exit:4 Enter operands:3 2 1 1)add, 2)sub, 3)multiply, 4) divide, 5) exit:4 Enter operands:2 1 2 1)add, 2)sub, 3)multiply, 4) divide, 5) exit:4 Enter operands:3 0 Division by zero error! 1)add, 2)sub, 3)multiply, 4) divide, 5) exit:5 Bye!