Trying to learn Java using Codesdope. I am stuck on this question.:Take integer inputs from user until he/she presses q ( Ask to press q to quit after

This is my code: 

I tried a while loop first, but now trying a do while loop.. I am so lost. please help, if you can give me the answer please explain, I am not looking for just an answer… I am looking to understand… Thank you...(I am very new to Java).

Scanner input = new Scanner(System.in);

String choice = "";
do{
    System.out.println("Please enter a number: ");
     int num = input.nextInt();
    System.out.println("Please enter another number or q to quit. ");
    choice = input.next();
    
int result = Integer.parseInt(choice);
    
int sum;

sum = num + result;

while(!choice.equals("q")) //to compare a STRING YOU NEED( "STRING NAME.EQUALS ("STRING"))// To get NOT is !(stringname).equals("string").
{
   System.out.println("You have quit. The sum of your numbers is : "+sum);

}
}
 

I was unable to get the sum to keep adding the new numbers so I changed it to a do while loop and now ot just crashes when I have no errors in netbeans..

Answers

•   
  

  You want to get sum and product of all the integers and also the number of integers that you have for getting the average.

  So, first let’s define three variables:

  sum = 0

  product = 1

  count = 0

  After we get some number, we will add it to the sum and the sum will then become that number and we will continue to do so.

  e.g., number = 4 → we will add 4 to sum (0+4) and then the sum will become 4, again the number given is 2 → we will add 2 to sum (4+6) and then it will become 6 (it is 4 with previous addition).

  Similarly, we will get the product

  e.g., number = 4 → we will multiply 4 to the product (1*4) and then product will become 4, again the number given is 2 → we will multiply 2 to the product (4*2) and then it will become 8 (it is 4 with previous multiplication).

  So, we have a structure like this:

  int sum = 0;
  int product = 0;
  int count = 0;
  Scanner input = new Scanner(System.in);
  
  while(condition){
      if(!choice.equals("q")){
          int number = Integer.parseInt(choice);
  
          sum = sum+number;
          product = product*number;
          count++;
      }
  }
  

  Now, we want to do the handling part with q.

  So, it will look something like this:

  String choice = "";
  while(!choice.equals("q")){
  
      System.out.println("Enter q to quit or any number to continue");
      choice = input.next();
  }
  

  So, this will take input from the user and it it is q, then the value of the choice will become q and while loop will stop.

  So, the whole code is something like this:

  import java.util.*;
  
  class Test {
  public static void main(String[] args) {
  
  String choice = "";
  
  int sum = 0;
  int product = 1;
  int count = 0;
  Scanner input = new Scanner(System.in);
  
  while(!choice.equals("q")){
      System.out.println("Enter a number or q to quit");
      choice = input.next();
  
      if(!choice.equals("q")){
          int number = Integer.parseInt(choice);
          sum = sum+number;
          product = product*number;
          count++;
      }
  } 
  
  System.out.println("Product is: "+product+"\nAverage is: "+((float)sum/count));
  
  }
  }
  

   

  
  

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