public void SimpleInput()
        {
            double num = calc.ComputeResult(5, 5, "+");

            Assert.AreEqual(10, num);

            num = calc.ComputeResult(5, 0, "+");
            Assert.AreEqual(5, num);

            num = calc.ComputeResult(0, 5, "+");
            Assert.AreEqual(5, num);

            num = calc.ComputeResult(5, 5, "-");
            Assert.AreEqual(0, num);

            num = calc.ComputeResult(5, 5, "*");
            Assert.AreEqual(25, num);

            num = calc.ComputeResult(5, 5, "/");
            Assert.AreEqual(1, num);
        }