Java Program to Find the Sum of n Square Numbers

This is the Java Program to Find the Sum of n Square Numbers.

Problem Description

Given an integer says n, find out the sum of the first n squared numbers.

Problem Solution

The sum of the first n squared numbers can be calculated using the formula :

sum = n*(n+1)*(2n+1)/6

Program/Source Code

Here is the source code of the Java Program to Find the Sum of n Square Numbers. The program is successfully compiled and tested using IDE IntelliJ Idea in Windows 7. The program output is also shown below.

```
 
```

//Java Program to Find the Sum of n Square Numbers

```
 
```
```
import java.io.BufferedReader;
```
```
import java.io.InputStreamReader;
```
```
 
```
```
public class SumOfNSquareNumbers {
```

    // Function to read n and display the sum

    public static void main(String[] args) {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

```
        int n;
```

        System.out.println("Enter the value of n");

```
        try{
```

            n = Integer.parseInt(br.readLine());

```
        }catch (Exception e){
```

            System.out.println("An error occurred");

```
            return;
```
```
        }
```
```
        if(n<0){
```

            System.out.println("n cannot take negative values");

```
            return;
```
```
        }
```
```
        double sum = n*(n+1)*(2*n+1)/6;
```

        System.out.println("The sum of first " + n + " squared numbers is " + sum);

```
    }
```
```
}
```

Program Explanation

In the function main(), firstly an integer n is entered and then the sum is calculated as per the line,
double sum = n*(n+1)*(2*n+1)/6. Finally, the sum is displayed.

Time Complexity: O(1).

Runtime Test Cases

 
Case 1 (Simple Test Case):
 
Enter the value of n
15
The sum of first 15 squared numbers is 1240.0

Sanfoundry Global Education & Learning Series – Java Programs..

Note: Join free Sanfoundry classes at Telegram or Youtube

If you find any mistake above, kindly email to [email protected]

« Prev - Java Program to Print the First n Square Numbers

» Next - Java Program to Find the Sum of n Cube Numbers

Related Posts:

Recommended Articles: