SimpleCalculator.java I need help with this program, i have no idea where to sta

Question

SimpleCalculator.java

I need help with this program, i have no idea where to start. I need to have a different class for Calculator, CalculatorTest and UnknownOperatorException

Write a program that can serve as a simple calculator. This calculator keeps track of a single number (of type double) that is called result and that starts out as 0.0. Each cycle allows the user to repeatedly add, subtract, multiply, or divide by a second number. The result of one of these operations becomes the new value of result. The calculation ends when the user enters the letter R for

Explanation / Answer

//import Scanner as we require it.

import java.util.Scanner;

// the name of our class its public

public class SimpleCalculator {

    //void main

        public static void main (String[] args)

        {

            //declare int and char

            int a,b,result=0;

            char c;

            //Declare input as scanner

            Scanner input = new Scanner(System.in);

            //Take inputs

             System.out.println("Enter no. :");

             a = input.nextInt();

             System.out.println("Enter no. :");

             b = input.nextInt();

             System.out.println("Enter Operator :");

             String st = input.next();

             c = st.charAt(0);

             //add a switch statement

             switch(c)

             {

             case '+':

                 result = a+b;

                 System.out.println("Result = "+result);

                 break;

             case '-':

                 result = a-b;

                 System.out.println("Result = "+result);

                 break;

             case 'x':

                 result = a*b;

                 System.out.println("Result = "+result);

                 break;

             case '/':

                 result = a/b;

                 System.out.println("Result = "+result);

                 break;

             default:

                System.out.println("Syntax Error");

             }

        }

}

Output

Enter no. :
12
Enter no. :
54
Enter Operator :
x
Result = 648

How does it work

Extending it

The program can be extended. You can use more numbers or other functions of calculator like square, root,trigonometry, etc to expand it. Go ahead

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