How To Sum The Even Numbers Using Loop

Question

I need help on this code I seem to have a problem regarding on summing the even numbers, what I want to happen is that the even numbers will be outputted and at the same time there will be an output where all the even numbers are summed within the inputted range of the user. I am just a beginner at coding and I hope some people can help me.

import java.util.*;
public class Loop
{
    //Start
    public static void main(String args[]) 
    {
        
        Scanner console = new Scanner(System.in) ;
        System.out.println("Enter Start Number") ;
        int start =console.nextInt();
        System.out.println("Enter End Number") ;
        int end =console.nextInt();
        
        int sum = 0;
        System.out.println("The even numbers between "+start+" and "+end+" are the following: ");
        for (int r = start; r <= end; r++)
        {
        //if number%2 == 0 it means its an even number
        if(r % 2 == 0)
        {
        System.out.println(r);
        }
        }
    }
}

Answer 1

A concise way using Java streams. Just putting it here so that you know that there is another way to do this:

int sum = IntStream.range(start, 1 + end).filter(num -> 0 == num % 2).peek(System.out::println).sum();
System.out.println(sum);

Answer 2

You can use with sum+=r; and get the sum :

    public static void main(String args[]) 
    {
        
        Scanner console = new Scanner(System.in) ;
        System.out.println("Enter Start Number") ;
        int start =console.nextInt();
        System.out.println("Enter End Number") ;
        int end =console.nextInt();
        
        int sum = 0;
        System.out.println("The even numbers between "+start+" and "+end+" are the following: ");
        for (int r = start; r <= end; r++)
        {
        //if number%2 == 0 it means its an even number
        if(r % 2 == 0)
        {
            sum += r;
        System.out.println(r);
        }
        }
        System.out.println("The sum of even numbers between :"+start +" - "+end +" is : "+sum);
    }
}

Output :

Enter Start Number
10
Enter End Number
20
The even numbers between 10 and 20 are the following: 
10
12
14
16
18
20
The sum of even numbers between :10 - 20 is : 90

Answer 3

you are almost there

   int sum = 0;
    System.out.println("The even numbers between "+start+" and "+end+" are the following: ");
    for (int r = start; r <= end; r++)
    {
    if(r % 2 == 0)
    {
    sum = sum + r;
    System.out.println(r);
    }
    }
    System.out.println("the sum : "+sum);