69: Write a program in C++ to calculate the sum of the series (1*1) + (2*2) + (3*3) + (4*4) + (5*5) + ... + (n*n).

 

// Write a program in C++ to calculate the sum of the series (1*1) + (2*2) + (3*3) + (4*4) + (5*5) + ... + (n*n). Go to the editor

//     Sample Output:

//     Input the value for nth term: 5

//     1*1 = 1

//     2*2 = 4

//     3*3 = 9

//     4*4 = 16

//     5*5 = 25

//     The sum of the above series is: 55

//     **************************************************************************************************

#include <iostream>

using namespace std;

int main()

{

    int num;

    cout << "\nInput the value of nth terms: ";

    cin >> num;

 cout << "\n***************************************************\n\n";

        int sum = 0, product;

        for (int i = 1; i <= num; i++)

        {

            product = i * i;

            sum = sum + product;

            cout << i << '*' << i << " = " << product << endl;

        }

        cout << "The sum of above series is: " << sum << endl;

 cout << "\n***************************************************\n\n";

        int sum_while = 0, prod_while , j=1;

        while (j<=num)

        {

            prod_while = j * j;

            sum_while = sum_while + prod_while;

            cout << j << '*' << j << " = " << prod_while << endl;

            j++;

        }

        cout << "The sum of above series is: " << sum_while << endl;

 cout << "\n***************************************************\n\n";

    return 0;

}