﻿ C# Sharp Exercises: Sum of first n natural numbers - w3resource

# 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.

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 : ");
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
```

C# Sharp Code Editor:

```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 : ");
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);
}
}```

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