C# Sharp Exercises: Sum of first n natural numbers

C# Sharp Recursion : Exercise-3 with Solution

Write a program in C# Sharp to find the sum of first n natural numbers using recursion.

Pictorial Presentation:

Sample Solution:

C# Sharp Code:

using System;
class RecExercise3
{
static void Main(string[] args) 
    {
    Console.Write("\n\n Recursion : Sum of first n natural numbers :\n");
    Console.Write("--------------------------------------------------\n");
	Console.Write(" How many numbers to sum : ");
	int n = Convert.ToInt32(Console.ReadLine());    
    Console.Write(" The sum of first {0} natural numbers is : {1}\n\n", n,SumOfTen(1,n));
    }

static int SumOfTen(int min, int max) 
    {
    return CalcuSum(min, max);
    }

static int CalcuSum(int min, int val) 
    {
    if (val == min)
        return val;
    return val + CalcuSum(min, val - 1);
    }
}

Sample Output:

Recursion : Sum of first n natural numbers :                                                                 
--------------------------------------------------                                                            
 How many numbers to sum : 5                                                                                  
 The sum of first 5 natural numbers is : 15  

Flowchart :

C# Sharp Code Editor:

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