Command Calculator

//Run this in the command prompt of a java capable computer, this was made by a beginner over the course of 3 hours.

import java.util.*; class RunCalculator{ public static void main (String[] args){ Scanner Scanner = new Scanner(System.in); System.out.println("Input starting number:"); double n = Scanner.nextInt(); int x = 0; String Add = "Add"; String Div = "Div"; String Mult = "Mult"; String Sub = "Sub"; String End = "End";

while (x==0){
    System.out.println("Please choose method, type Add for addition, Sub for subtraction, Mult for multiplication, and Div for division, followed by a space then the next number, Ex. Add 3.");
    String Meth = Scanner.next();
    double i = Scanner.nextDouble();
    if (Meth.equalsIgnoreCase(Add)){
        n+=i;
        System.out.println("your new total is " + n);}
    else if (Meth.equalsIgnoreCase(Sub)){
        n-=i;
        System.out.println("your new total is " + n);}
    else if (Meth.equalsIgnoreCase(Div)){
        n/=i;
        System.out.println("your new total is " + n);}
    else if (Meth.equalsIgnoreCase(Mult)){
        n*=i;
        System.out.println("your new total is " + n);}
    else{
        System.out.println("Invalid input");}
    }

System.exit(0); } }