ZCW-MacroLabs-OOP-ScientificCalculator/Calculator.java

import java.util.*;
class Calculator{
    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.equals("quit")){
                off = true;
                System.out.println("Goodbye!!");

            } else {

                //System.out.println("toDO is: " + toDo);

                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);
                    memory = result;
                    calc.printAns(String.valueOf(result));
                    break;

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

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

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

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

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

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

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

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

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

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

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

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

        }
    }
}