Question

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

Answer 1

// here is code in C++.

#include <bits/stdc++.h>

using namespace std;

// main function

int main()

{

// variables

int n=5;

int k,total=0;

int copy=n;

// while loop to calculate cubes

while(n)

{

// find cube

k=n*n*n;

// find total

total=total+k;

// decrease n

n--;

}

// print sum of cubes of first n whole numbers

cout<<"Sum of cube of first "<<copy<<" numbers is "<<total<<endl;

return 0;

}

Step-by-step explanation:

Declare three variables n, k and total. initialize n with 5.In the while loop, calculate cube of n then add it to total.Then decrease the n by 1.While loop run until n becomes 0.After the while loop,total will have the sum of cubes of first n whole numbers.

Output:

Sum of cube of first 5 numbers is 225