Fibonacci Series using Recursion in C++

This C++ Program demonstrates the the computation of Fibonacci Numbers using Recursion.

Here is source code of the C++ Program to Find Fibonacci Numbers using Recursion. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/* 
```

 * C++ Program to Find Fibonacci Numbers using Recursion

```
 */
```
```
#include <cstring>
```
```
#include <iostream>
```
```
#include <cstdlib>
```
```
#define ll long long
```
```
using namespace std;
```
```
 
```
```
/* 
```

 * Recursive function to find Fibonnaci Numbers

```
 */
```
```
ll fibo_recur(int n)
```
```
{
```
```
    if (n == 1 || n == 2)
```
```
        return 1;
```
```
    else
```

        return fibo_recur(n - 1) + fibo_recur(n - 2);;

```
}
```
```
/* 
```
```
 * Main
```
```
 */
```
```
int main()
```
```
{
```
```
    int n;
```
```
    while (1)
```
```
    {
```

        cout<<"Enter the integer n to find nth fibonnaci no.(0 to exit): ";

```
        cin>>n;
```
```
        if (n == 0)
```
```
            break;
```
```
        cout<<fibo_recur(n)<<endl;
```
```
    }
```
```
    return 0;
```
```
}
```

$ g++ fibo_recur.cpp
$ a.out
 
Enter the integer n to find nth fibonnaci no.(0 to exit): 1
1
Enter the integer n to find nth fibonnaci no.(0 to exit): 2
1
Enter the integer n to find nth fibonnaci no.(0 to exit): 3
2
Enter the integer n to find nth fibonnaci no.(0 to exit): 4
3
Enter the integer n to find nth fibonnaci no.(0 to exit): 5
5
Enter the integer n to find nth fibonnaci no.(0 to exit): 6
8
Enter the integer n to find nth fibonnaci no.(0 to exit): 7
13
Enter the integer n to find nth fibonnaci no.(0 to exit): 8
21
Enter the integer n to find nth fibonnaci no.(0 to exit): 9
34
Enter the integer n to find nth fibonnaci no.(0 to exit): 10
55
Enter the integer n to find nth fibonnaci no.(0 to exit): 0
 
------------------
(program exited with code: 1)
Press return to continue

Sanfoundry Global Education & Learning Series – 1000 C++ Programs.

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