Question

java :

Given an int variable n that has been initialized to a positive value and, in addition, int variables k and total that have already been declared,
use a do...while loop to compute the sum of the cubes of the first n whole numbers, and store this value in total.

Use no variables other than n, k, and total.

Answer 1

SumOfCubes.java:

public class SumOfCubes {
    public static void main(String args[]) {
       int n=10;//n is value for which we need sum of cubes upto
       int k=1,total=0;//k is used for iteration and total to store the sum
       do
       {
          total = total + k*k*k;//calculating cube of number and adding it to total
          k++;
       }
       while(k<=n);
       System.out.println(total);//print value of total
    }
}

Output:

SumOfCubes.java:( value of n entered during run-time)

import java.util.*;

public class SumOfCubes {
    public static void main(String args[]) {

      Scanner in = new Scanner(System.in);
       int n=0;//n is value for which we need sum of cubes upto
       int k=1,total=0;//k is used for iteration and total to store the sum

       System.out.println("Enter value of n:");//input given during run-time
       n = in.nextInt();
       do
       {
          total = total + k*k*k;//calculating cube of number and adding it to total
          k++;
       }
       while(k<=n);
       System.out.println(total);//print value of total
    }
}

Output: