# Function Fibonacci - Practice Exercises C# Sharp

## Lesson 5:

## Functions

## Exercise 5.13:

## Function Fibonacci

## Objetive:

## Create a program that uses recursion to calculate a number in the Fibonacci series (in which the first two items are 1, and for the other elements, each one is the sum of the preceding two).

## Source Code:

```
using System;
public class F_Fibonacci
{
public static int Fibonacci(int number)
{
if ((number == 1) || (number == 2))
return 1;
else
return Fibonacci(number - 1) + Fibonacci(number - 2);
}
public static void Main()
{
int number;
Console.Write("Enter a number: ");
number = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Fibonacci of {0} is {1}", number,
Fibonacci(n));
}
}
```

Exercisey
5.13