Java Rate/Revise my code (Calculator)

Code
import java.util.Scanner;

 

public class Calculator {

    

    public static void main(String[] args) 

    {

        Scanner input = new Scanner(System.in);

        boolean loop = true;

        while(loop == true)

        {

            System.out.println("What operation would you like to use?");

            String operation = input.nextLine();

            if (operation.equalsIgnoreCase("addition"))

            {

                double fnum, snum, answer;

                System.out.println("Enter First Number:");

                fnum = input.nextDouble();

                System.out.println("Enter Second Number:");

                    snum = input.nextDouble();

                System.out.println(fnum+snum);

                }

            else if (operation.equalsIgnoreCase("subtraction"))

            {

                double fnum, snum, answer;

                System.out.println("Enter First Number:");

                fnum = input.nextDouble();

                System.out.println("Enter Second Number:");

                snum = input.nextDouble();

                System.out.println(fnum-snum);

            }

            else if (operation.equalsIgnoreCase("division"))

            {

                double fnum, snum, answer;

                System.out.println("Enter First Number:");

                fnum = input.nextDouble();

                System.out.println("Enter Second Number:");

                snum = input.nextDouble();

                System.out.println(fnum/snum);

            }

            else if (operation.equalsIgnoreCase("multiplication"))

            {

                double fnum, snum, answer;

                System.out.println("Enter First Number:");

                fnum = input.nextDouble();

                System.out.println("Enter Second Number:");

                snum = input.nextDouble();

                System.out.println(fnum*snum);

            }

            else if (operation.equalsIgnoreCase("exit"))

            {

                loop = false;

            }

        else

        {

            System.out.println("Incorrect Entry!");

        }

        }        

    }

}