Program for sum of natural Ncubes

/* using for loop*/


import java.util.*;
 class SumNQubes {

public static void main(String[] args) {
Scanner scan=new Scanner(System.in);
   
         int sum=0;
System.out.println("enter number");
int n=scan.nextInt();

for(int i=0;i<=n;i++)
{
sum=sum+(i*i*i);
}

System.out.println("sum of "+n+"^3 natural numbers"+sum);




}}




OUTPUT:


enter number
10

sum of 10^3 natural numbers: 3025




/*Using mathematical formulae*/


import java.util.*;
 class SumNCubes {

public static void main(String[] args) {
Scanner scan=new Scanner(System.in);
   

System.out.println("enter number");
int n=scan.nextInt();
int S= n*n*(n+1)*(n+1)/4;
System.out.println("Sum of Ncubes are:"+S);
}}



OUTPUT:

enter number
10

Sum of Ncubes are:3025