import java.util.*;

public class Calculator{

    /**
     * Write a description of class Calculator here.
     *
     * @author (your name)
     * @version (a version number or a date)
     */

    public static double lastAns = 0;

    public static void main(String args[]){
        String toDo;                //what the user wants to do
        double num1 = 0;                //The user's first input
        double num2 = 0;            //The user's second input
        double result = 0;          //The user's answer
        boolean off = false;        //The user typed quit, becomes true

        double memory;

        boolean error = false;
        MathMethods calc = new MathMethods();

        while (off == false){
            Scanner input1 = new Scanner(System.in);
            System.out.println("What do you want to do?");

            toDo = input1.nextLine();

            if (toDo.equalsIgnoreCase("quit")){
                off = true;
                System.out.println("Goodbye!! \n \n");

            } else {
                switch (toDo) {
                    //System.out.println("toDO is: " + toDo);

                    case "add":
                    case "subtract":
                    case "multiply":
                    case "divide":
                    case "exponent":
                    case "cosine" :
                    case "inverse cosine" :
                    case "square root" :
                    case "invert" :
                    case "sine" :
                    case "inverse sine" :
                    case "degree to radian" :
                    case "radian to degree" :
                    case "square" :
                    case "tangent" :
                    case "inverse tangent" :
                    case "inverse" :
                    case "roundTo" :

                    System.out.println(toDo + " -- Enter first number:");
                    num1 = input1.nextDouble();
                    //System.out.println("num1 is: " + num1);
                }
                    switch (toDo){
                        case "add":
                        case "subtract":
                        case "multiply":
                        case "divide":
                        case "exponent":
                        System.out.println(toDo + " -- Enter second number:");
                        num2 = input1.nextDouble();
                        //System.out.println("num2 is: " + num2);

                    }

                    switch (toDo) {        

                        case "add":
                        result = calc.add(num1, num2);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;

                        case "subtract":
                        result = calc.subtract(num1, num2);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;

                        case "multiply":
                        result = calc.multiply(num1, num2);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;

                        case "divide":
                        result = calc.divide(num1, num2);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;

                        case "exponent":
                        result = calc.exponent(num1, num2);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;

                        case "cosine":
                        result = calc.cosine(num1);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;

                        case "inverse cosine":
                        result = calc.invCosine(num1);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;

                        case "square root":
                        result = calc.squareRoot(num1);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;

                        case "invert":
                        result = calc.invert(num1);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;

                        case "sine":
                        result = calc.sin(num1);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;

                        case "inverse sine":
                        result = calc.iSin(num1);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;

                        case "degree to radian":
                        result = calc.degToRad(num1);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;

                        case "radian to degree":
                        result = calc.radToDeg(num1);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;

                        case "fortune cookie":
                        calc.printAns(calc.fortuneCookie());
                        break;

                        case "display mode decimal":
                        calc.printAns(String.valueOf(lastAns));
                        break;

                        case "display mode hexadecimal":
                        calc.printAns(calc.switchDisplayMode("hexadecimal"));

                        case "display mode octal":
                        calc.printAns(calc.switchDisplayMode("octal"));
                        break;

                        case "display mode binary":
                        calc.printAns(calc.switchDisplayMode("binary"));
                        break;

                        case "display mode" :
                        calc.printAns(calc.switchDisplayMode());
                        break;

                        case "random number":
                        result = calc.randomNumber();
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;      

                        case "square":
                        result = calc.square(num1);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;

                        case "inverse":
                        result = calc.inverse(num1);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;

                        case "tangent":
                        result = calc.tangent(num1);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break;

                        case "inverse tangent":
                        result = calc.iTan(num1);
                        lastAns = result;
                        calc.printAns(String.valueOf(result));
                        break; 

                        case "MR" :
                        result = Memory.memRead();
                        Memory.printAns(String.valueOf(result));
                        break;

                        case "M+" :
                        result = Memory.memUpdate(lastAns);
                        Memory.printAns(String.valueOf(result));
                        break;

                        case "MC" :
                        result = Memory.memClear();
                        Memory.printAns(String.valueOf(result));
                        break;

                        case "roundTo":
                        memory = result;
                        calc.roundTo(memory, (int)num1);
                        break;

                    }
                }
            }
        }

    }