如何从一行中汇总任意数量的用户输入数字

Question

Trying to figure out how I would take any amount of inputted numbers from a user and add them together

Example user input: 1 2 3 4 Sum = 10

The user can put any amount of numbers in not a specified amount so if he wanted to add 1 2 3 4 5 6 7 8 9 10 11 12 13, it would sum them all up to 91

Thanks for the help in advance.

import java.util.Scanner;

public class test
{
    public static final int SENTINEL = -1;
    public static void main(String[] args) {
        Scanner kb = new Scanner(System.in);
        int score = 0;
        int sum = 0;

        System.out.println("Enter numbers here");
        while (score >= 0) {
            if (score <= -1) {
            score = kb.nextInt();
            sum += score;
            score = 0;
        }
            System.out.println(sum);
    }
  }
}

---

Thanks to libik for all his time and help, here is the finished code.

import java.util.Scanner;

public class JavaApplication1156 {

    public static void main(String[] args) {
    System.out.println("Enter numbers here");
    int sum;
    do {
        Scanner kb = new Scanner(System.in);
        int score = 0;
        sum = 0;
        String line = kb.nextLine();
        kb = new Scanner(line); //has to do this to make the kb.hasNexInt() work.
        while (kb.hasNextInt()) {
            score = kb.nextInt();
            sum += score;
        }
        if (sum <= -1)
        System.out.println("Application ended");
        else if (sum >= 0)
        System.out.println("Sum = " + sum);

    } while (sum != -1);
  }

}

Answer 1

It is very easy actually

import java.util.Scanner;

public class JavaApplication115 {

    public static void main(String[] args) {
        System.out.println("write numbers, if you write zero, program ends");
        Scanner input = new Scanner(System.in); //just copy-and paste this line, you dont have to understand it yet.
        int number;
        int sum = 0;
        do {
            number = input.nextInt(); //this reads number from input and store its value in variable number
            sum+= number; //here you add number to the total sum
        } while(number != 0); //just repeat cycle as long as number is not zero

        System.out.println("Sum is : " + sum);
    }

}

---

Working code based on your code :

public static void main(String[] args) {
    Scanner kb = new Scanner(System.in);
    int score = 0;
    int sum = 0;

    System.out.println("Enter numbers here");
    String line = kb.nextLine();

    kb = new Scanner(line); //has to do this to make the kb.hasNexInt() work.
    while (kb.hasNextInt()) {
        score = kb.nextInt();
        sum += score;
    }
    System.out.println(sum);
}

---

Also if you are interested in "minimal" version, which is the same as the one before, but using as less code as possible, here it is :

public static void main(String[] args) {
    int sum = 0;
    System.out.println("Enter numbers here");
    Scanner kb = new Scanner((new Scanner(System.in)).nextLine()); //has to do this to make the kb.hasNexInt() work.
    while (kb.hasNextInt()) {
        sum += kb.nextInt();
    }
    System.out.println(sum);
}

---

Find sum of each line as long as sum is not zero (based on second block of code) :

public static void main(String[] args) {
    System.out.println("Enter numbers here");
    int sum;
    do {
        Scanner kb = new Scanner(System.in);
        int score = 0;
        sum = 0;
        String line = kb.nextLine();
        kb = new Scanner(line); //has to do this to make the kb.hasNexInt() work.
        while (kb.hasNextInt()) {
            score = kb.nextInt();
            sum += score;
        }
        System.out.println("Sum = " + sum);
    } while (sum != 0);
}

Answer 2

Question - Keep taking numbers as inputs till the user enters 'x', after that print sum of all.

Scanner sc = new Scanner(System.in);
        int input = 0;
        int sum = 0;
        while (true){
            sum = sum+input;
            if (input==5){
                System.out.println("Loop is stopped");
                System.out.println("The sum is " + sum);
                break;
            }
            else {
                System.out.println("Take the inputs");
                input = sc.nextInt();
            }
        }

Answer 3

//Input the number in a single line (but be in size limit of integer)

import java.util.Scanner;

public class Sum_of_integers {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int num = sc.nextInt();
        int sum = 0;
        while(num >= 1) {  //base value
            int lastval = num % 10;  //the logic
            num = num  / 10;
            sum += lastval;
        }
        System.out.println(sum);
    }
}