Write a C++ Program to Calculate Sum of Series 1²+2²+3²+n² with an example. The math formula to find Sum of Series 1²+2²+3²+…+n² = n(n + 1)(2n + 1)/6.
#include<iostream>
using namespace std;
int main()
{
int number, sum = 0;
cout << "Please Enter the Number to find sum of Series 1^2 + 2^2 = ";
cin >> number;
sum = (number * (number + 1) * (2 * number + 1 )) / 6;
cout << "\nThe Sum of the Series of " << number << " number = " << sum ;
return 0;
}
This below shown the C++ Program to Calculate Sum of Series 1²+2²+3²+n² is the same as the above. Here, we used C++ for loop to display the 1²+2²+3²+n² series as an output.
#include<iostream>
using namespace std;
int main()
{
int number, sum = 0;
cout << "Please Enter the Number to find sum of Series 1^2 + 2^2 = ";
cin >> number;
sum = (number * (number + 1) * (2 * number + 1 )) / 6;
cout << "\nThe Sum of the Series of " << number << " number = " << sum << "\n\n";
for(int i = 1; i <= number; i++)
{
if (i != number)
cout << i << "^2 + ";
else
cout << i << "^2 = " << sum;
}
return 0;
}
C++ Program to Calculate Sum of Series 1²+2²+3²+n² using Functions
#include<iostream>
using namespace std;
void sumOfSeries (int number)
{
int sum = 0;
sum = (number * (number + 1) * (2 * number + 1 )) / 6;
cout << "\nThe Sum of the Series of " << number << " number = " << sum << "\n\n";
for(int i = 1; i <= number; i++)
{
if (i != number)
cout << i << "^2 + ";
else
cout << i << "^2 = " << sum;
}
}
int main()
{
int number;
cout << "Please Enter the Number to find sum of Series 1^2 + 2^2 = ";
cin >> number;
sumOfSeries (number);
return 0;
}