java - Keep adding two numbers until the input is not a double type -

I am trying to create a simple calculator program where a user enters two values, by adding method () Operation is called the class and values ​​are added and the result is displayed. And then I am using the loop while doing the do, in which the user records the values ​​that are added to the previous total and the result is displayed. It must continue to run until the user enters some input which is not double type

  import java.util.Scanner; Public class app {public static zero main (string [] args) {scanner input = new scanner (System.in); System.out.println ("Enter first number:"); Double number = input.nextDouble (); System.out.println ("Enter second number:"); Double No. 2 = Input NXD double (); Double total = operation.ed (number, number 2); Println (total); System.out.println ("Enter number again :); number 2 = input. New double (); do {total = operations.ed (total, number 2); system.out.printLN (total); system.out .printLN ("re-enter number:"); number2 = input .nxtDouble ();} while (input.hasNextDouble ()); System.out.println ("exit.");}}  

and there is operating class

  public class operations {public static double addition (double N 1, double N2) {return N1 + N2;}} < / Code> 

pair this first two values It displays the results, and displays the results again. Then this value asks again, the user inputs, and it displays the result. But there is a problem here, which I tried but could not do it, so please Look at the code and tell me where the problem is. While doing so, something that is doing me wrong.

Output:

Enter the first number

5

Enter the second number:

2

7.0

Enter the number again:

1

8.0

Please enter the number again:

2

The program is running but it does, for example, I press 6 again, it still adds 2 (which I had previously entered) and demonstrates that

6

10.0

Please enter the number again:

< Div class = "post-text" itemprop = "text">

Your problem is in order that you are indicating and doing things Want to input at the beginning of time: Enter

  to {system.out.println ( "Re-number"); Number2 = input.nextDouble (); Total = operation.ed (total, number 2); Println (total); } While (input.hasNextDouble ());  

It redefines the signal and re-input before, so your last category looks like this:

  public static zero main (string [] Args) {scanner input = new scanner (System.in); System.out.println ("Enter first number:"); Double number = input.nextDouble (); System.out.println ("Enter second number:"); Double No. 2 = Input NXD double (); Double total = operation.ed (number, number 2); Println (total); Do {System.out.println ("Enter the number again:"); Number2 = input.nextDouble (); Total = operation.ed (total, number 2); Println (total); } While (input.hasNextDouble ()); Println ("Exit."); }