C#: Calculate n terms of square natural number and their sum

C# Sharp For Loop: Exercise-25 with Solution

Write a C# Sharp program that displays the n terms of square natural numbers and their sum.
The series is as below:

Sample Solution:-

C# Sharp Code:

using System;  // Importing necessary namespace

public class Exercise25  // Declaration of the Exercise25 class
{  
    public static void Main()  // Main method, entry point of the program
    {
        int i, n, sum = 0;  // Declaration of variables i, n, and sum as integers

        Console.Write("\n\n");  // Displaying new lines
        Console.Write("Calculate n terms of square natural number and their sum:\n");  // Displaying the purpose of the program
        Console.Write("-----------------------------------------------------------");  // Displaying a separator
        Console.Write("\n\n");  	

        Console.Write("Input the number of terms : ");  // Prompting the user to input the number of terms
        n = Convert.ToInt32(Console.ReadLine());  // Reading the number of terms entered by the user

        Console.Write("\nThe square natural upto {0} terms are :", n);  // Displaying a message for square natural numbers

        // Loop to calculate square natural numbers and their sum
        for (i = 1; i <= n; i++)
        {
            Console.Write("{0}  ", i * i);  // Displaying the square of natural numbers
            sum += i * i;  // Calculating the sum of square natural numbers
        }

        // Displaying the sum of square natural numbers
        Console.Write("\nThe Sum of Square Natural Number upto {0} terms = {1} \n", n, sum);
    } 
}

Sample Output:

Calculate n terms of square natural number and their sum:                                                                                                      
-----------------------------------------------------------                                                                                                    
Input the number of terms : 10                                                                                                         
The square natural upto 10 terms are :1  4  9  16  25  36  49  64  81  100                                                                                     
The Sum of Square Natural Number upto 10 terms = 385   

Flowchart:

C# Sharp Code Editor:

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