public void SwapNumbers_ReturnsCorrectValue_ForTwoPositiveNumbers()
        {
            // Arrange
            var num1 = 1;
            var num2 = 2;

            // Act
            Question16_1.SwapNumbers(ref num1, ref num2);

            // Assert
            Assert.AreEqual(2, num1);
            Assert.AreEqual(1, num2);
        }
        public void SwapNumbers_ReturnsCorrectValue_ForNumbersWithSameValue()
        {
            // Arrange
            var num1 = 1;
            var num2 = 1;

            // Act
            Question16_1.SwapNumbers(ref num1, ref num2);

            // Assert
            Assert.AreEqual(1, num1);
            Assert.AreEqual(1, num2);
        }