Write a Java-program to print sum of natural numbers using while loop ?

Write a Java-program to print sum of natural numbers using while loop ?

Program

public class Main
{
    public static void main(String args[])
    {
        int x=1,n=5,sum=0;
        while(x<=n)
        {  
            sum=sum+x; 
            x++;
        }
        System.out.print(sum);
    }
}	

15

Using CommandLine Arguments

public class Main
{
    public static void main(String args[])
    {
        int x=1,n,sum=0;
        n=Integer.parseInt(args[0]);
        while(x<=n)
        {  
            sum=sum+x; 
            x++;
        }
        System.out.print(sum);
    }
}	

15

Using Scanner Class

import java.util.*;
public class Main
{
    public static void main(String args[])
    {
        int x=1,n,sum=0;
        Scanner s=new Scanner(System.in);
        System.out.println("Enter n value");
        n=s.nextInt();
        while(x<=n)
        {  
            sum=sum+x; 
            x++;
        }
        System.out.print(sum);
    }
}	

Enter n value : 5
15

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