Java - adding value in a while loop

Question

this one just is hurting my brain. http://programmingbydoing.com/a/adding-values-in-a-loop.html

Write a program that gets several integers from the user.

Answer 1

Declare the int sum variable outside of the while loop and only have one guess = keyboard.nextInt() inside the loop. Add the user's guess to the sum in the loop as well.

Then after the loop output the user's sum.

I.e.:

int sum;
while(guess != 0)
{   
    guess = keyboard.nextInt();
    sum += guess;
}
System.out.println("Total: " + sum");

Edit: also remove the guess2 variable, as you will no longer need it.

Answer 2

import java.util.Scanner;

public class AddingInLoop {
    public static void main(String[] args) {
        Scanner keyboard = new Scanner(System.in);

        int number, total = 0;

        System.out.print("Enter a number\n> ");
        number = keyboard.nextInt();
        total += number;

        while (number != 0) {
            System.out.print("Enter another number\n> ");
            number = keyboard.nextInt();
            total += number;
        }
        System.out.println("The total is " + total + ".");
    }
}

You first prompt the user to enter a number. Then you store that number into total (total += number OR total = total + number). Then, if the number entered wasn't 0, the while loop executes. Every time the user enters a nonzero number, that number is stored in total ( the value in total is getting bigger) and the while loops asks for another number. If and when a user enters 0, the while loop breaks and the program displays the value inside total. :D I myself am a beginner and had a bit of an issue with the logic before figuring it out. Happy coding!

Answer 3

The code will be as below :

 public static void main(String[] args) throws Exception {
     Scanner keyboard = new Scanner(System.in);
     int input = 0;
     int total = 0;
     System.out.println("Start entering the number");
     while((input=keyboard.nextInt()) != 0)
         {   
             total = input + total;
         }
    System.out.println("The program exist because 0 is entered and sum is "+total);
}

Answer 4

Programming by Doing :)

    int x = 0;
    int sum = 0;
    System.out.println("I will add up the numbers you give me.");
    System.out.print("Number: ");
    x = keyboard.nextInt();
    while (x != 0) {
        sum = x + sum;
        System.out.println("The total so far is " + sum + ".");
        System.out.print("Number: ");
        x = keyboard.nextInt();
    }
    System.out.println("\nThe total is " + sum + ".");