Question

Hello I have a question about Java.

example

So when you put “sum 1 2 3” in console, you do not separate those. Need a space between sum 1, 2 in the console.

What is Sum?

sum 1 2 3

6 (answer)

sum 123456

21

sum 100 2000 3000

5100

sum 20 50 40 1

111

public static void main (String[] args) {

System.out.Println(“What is Sum?”);

String a=“”;

a = scnr.nextLine();

String[] b = a.split(“”);

if(b[0].equals(“sum”) {

}

Please do not change the above code. If I put sum in the console, it calculate the sum.

you may need to convert type from String to double.

I don’t know how to make code for the sum. Please help me by above code.

Answer 1

ANSWER: Here I am giving you the code and output if you have any problem then comment or like it please.

CODE:

import java.util.Scanner;

public class ReferenceMystery {

   /**
   * @param args
   */
   static int getSum(int n) // method to find the sum of a digit
{   
int sum = 0;
  
while (n != 0)
{
sum = sum + n % 10;
n = n/10;
}
  
return sum;
}
  
   public static void main(String[] args) {
       Scanner scnr= new Scanner(System.in);
      
       System.out.println("What is Sum?");

       String a="";

       a = scnr.nextLine();

       String[] b = a.split(" ");
      
       int add=0;
       if(b[0].equals("sum") ){
           if(b.length==2) { // when your array has only 2 elements only
               int a1=Integer.parseInt(b[1]);
               int add0=getSum(a1);
               System.out.println(add0);
              
           }else {
           for(int i=1;i<b.length;i++)
               add=add+Integer.parseInt(b[i]);
               System.out.println(add);
           }
       }
      
       }

}

OUTPUT: