C#: Display n natural numbers and their sum

C# Sharp For Loop: Exercise-3 with Solution

Write a C# Sharp program that displays the sum of n natural numbers.

Visual Presentation:

Sample Solution:

C# Sharp Code:

using System;  // Importing necessary namespace

public class Exercise3  // Declaration of the Exercise3 class
{  
    public static void Main()  // Main method, entry point of the program
    {
        int i, n, sum = 0;  // Declaration of variables 'i' for iteration, 'n' for storing user input, and 'sum' to store the total sum

        Console.Write("\n\n");  // Displaying new lines
        Console.Write("Display n terms of natural numbers and their sum:\n");  // Displaying the purpose of the program
        Console.Write("----------------------------------------------");  // Displaying a separator
        Console.Write("\n\n");
	
        Console.Write("Input Value 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 first {0} natural numbers are:\n", n);  // Displaying the header for the natural numbers

        for (i = 1; i <= n; i++)  // Loop to display and calculate the sum of the first 'n' natural numbers
        {
            Console.Write("{0} ", i);  // Printing each natural number
            sum += i;  // Adding each number to the sum
        }

        Console.Write("\nThe Sum of Natural Numbers up to {0} terms : {1} \n", n, sum);  // Displaying the total sum of the first 'n' natural numbers
    }
}

Sample Output:

Display n terms of natural number and their sum:                                                              
----------------------------------------------                                                                
                                                         
Input Value of terms : 5                                                                                      
                                                                                                              
The first 5 natural number are :                                                                              
1 2 3 4 5                                                                                                     
The Sum of Natural Number upto 5 terms : 15   

Flowchart:

C# Sharp Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a C# Sharp program to find the sum of first 10 natural numbers.
Next: Write a program in C# Sharp to read 10 numbers from keyboard and find their sum and average.