namespace myCalculator

{

    //Name: Sangalang, Franchezka Maureen M.

    //Section: BSCS 3-5

    class Program

    {

        static void Main(string[] args)

        {

            moreCalculation calcu = new moreCalculation();

​

            //header

            System.Console.WriteLine("Calculator");

            System.Console.WriteLine("Valid Operators: +, -, *, /, ^, %");

            System.Console.WriteLine();

​

            //user inputs

            System.Console.Write("Enter first number: ");

            string inputNum1 = System.Console.ReadLine();

            double num1;

            //checks if inputNum1 can be converted into a double

            if (double.TryParse(inputNum1, out num1))

            {

                System.Console.Write("Enter operator: ");

                string inputOperator = System.Console.ReadLine();

                //checks if the entered operator is a valid operator

                if ((inputOperator == "+" || inputOperator == "-" ||

                    inputOperator == "*" || inputOperator == "/" ||

                    inputOperator == "%" || inputOperator == "^"))

                {

​

                    System.Console.Write("Enter second number: ");

                    string inputNum2 = System.Console.ReadLine();

                    double num2;

                    //checks if the entered number can be parsed into a double

                    if (double.TryParse(inputNum2, out num2))

                    {

                        calcu.calculation(num1, inputOperator, num2);

                        System.Console.WriteLine();

                        System.Console.WriteLine("Result : {0}", calcu.resultOfCalcution);

                    }

                    else

                    {

                        System.Console.WriteLine("Invalid input second number");

                    }

                }

                else

                {

                    System.Console.WriteLine("Invalid input operator");

                }

            }

            else

            {

                System.Console.WriteLine("Invalid input first number");

            }

​

        }

    }//Main

​

    //Base Class

    class calculator

    {

        private double result;

​

        //Accessors and Mutators

        public double resultOfCalcution

        {

            get { return result; }

            set { result = value; }

        }//resultOfCalculation

​

        public virtual void calculation(double num1, string operation, double num2)

        {

            result = 0;

        }//calculation

    }//calculator

​

    //Derived Class: simple operation: addition, subtraction, multiplication, and division

    class simpleCalculation : calculator

    {

        public override void calculation(double num1, string operation, double num2)

        {

​

            switch (operation)

            {

                case "+":

                    resultOfCalcution = num1 + num2;

                    break;

                case "-":

                    resultOfCalcution = num1 - num2;

                    break;

                case "*":

                    resultOfCalcution = num1 * num2;

                    break;

                case "/":

                    resultOfCalcution = num1 / num2;

                    break;

                default:

                    System.Console.WriteLine("Invalid Operation");

                    break;

            }

        }//calculation

    }//simpleCalculation

​

    //Derived Class: Simple calculation: modulo and exponent 

    class moreCalculation : simpleCalculation

    {

        //For the power operation

        public double power(double num1, double num2)

        {

            double result = 1;

            for (int i = 0; i < num2; i++)

            {

                result = result * num1;

            }

            return result;

        }//power

​

        public override void calculation(double num1, string operation, double num2)

        {

            switch (operation)

            {

                case "%":

                    resultOfCalcution = num1 % num2;

                    break;

                case "^":

                    resultOfCalcution = power(num1, num2);

                    break;

                default:

                    base.calculation(num1, operation, num2);

                    break;

            }

        }//calculation

    }//moreCalculation

​

}