Question

in java, Ask the user for a bunch of integers. Show the sum of those numbers.

Make your program handle strange input. Specifically, if they didn't enter a number, scan the String to find just the digits and piece those digits together to form a number.

If the user enters something without any digits, end the program.

input:

5ENTER

10ENTER

endENTER

output:

Enter a integer\n
Current sum: 5\n
Enter a integer\n
Current sum: 15\n
Enter a integer\n
There were no digits in that input.\n
Final sum: 15\n

input

5ENTER
xxx4xxxENTER
z

output:

Enter a integer\n
Current sum: 5\n
Enter a integer\n
Well, that's not a number but here's what I extracted: 4\n
Current sum: 9\n
Enter a integer\n
There were no digits in that input.\n
Final sum: 9\n

input

,,4gg3ENTER
g6g7g8re7ENTER
2gfENTER
jh3ENTER
dfd4f5fENTER
ff21ENTER
********1x2e3errr4ww5ddd6ENTER
g

output:

Enter a integer\n
Well, that's not a number but here's what I extracted: 43\n
Current sum: 43\n
Enter a integer\n
Well, that's not a number but here's what I extracted: 6787\n
Current sum: 6830\n
Enter a integer\n
Well, that's not a number but here's what I extracted: 2\n
Current sum: 6832\n
Enter a integer\n
Well, that's not a number but here's what I extracted: 3\n
Current sum: 6835\n
Enter a integer\n
Well, that's not a number but here's what I extracted: 45\n
Current sum: 6880\n
Enter a integer\n
Well, that's not a number but here's what I extracted: 21\n
Current sum: 6901\n
Enter a integer\n
Well, that's not a number but here's what I extracted: 123456\n
Current sum: 130357\n
Enter a integer\n
There were no digits in that input.\n
Final sum: 130357\n

Answer 1

Given below is the code for question. Please do rate the answer if it helped. Thank you.
import java.util.Scanner;

public class SumNumbers {
  
   public static void main(String[] args) {
       Scanner keyboard = new Scanner(System.in);
       String str;
       int sum = 0;
       while(true) {
           System.out.print("Enter an integer: ");
           if(keyboard.hasNextInt())
               sum += keyboard.nextInt();
           else {
               str = keyboard.next();
               str = extractDigits(str);
               if(str.equals("")) {
                   System.out.println("There were no digits in that input.");
                   break;
               }
               else {
                   System.out.println("Well, that's not a number but here's what I extracted: " + str);
                   sum += Integer.parseInt(str);
               }
              
               System.out.println("Current sum: " + sum);
           }
       }
      
       System.out.println("Final sum: " + sum);

      
   }
  
   private static String extractDigits(String s) {
       String digits = "";
       for(int i = 0; i < s.length(); i++) {
           char c = s.charAt(i);
           if(Character.isDigit(c))
               digits += c;
       }
       return digits;
   }
}