C++ Program to Find Fibonacci Numbers using Recursion

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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.

  1. /* 
  2.  * C++ Program to Find Fibonacci Numbers using Recursion
  3.  */
  4. #include <cstring>
  5. #include <iostream>
  6. #include <cstdlib>
  7. #define ll long long
  8. using namespace std;
  9.  
  10. /* 
  11.  * Recursive function to find Fibonnaci Numbers
  12.  */
  13. ll fibo_recur(int n)
  14. {
  15.     if (n == 1 || n == 2)
  16.         return 1;
  17.     else
  18.         return fibo_recur(n - 1) + fibo_recur(n - 2);;
  19. }
  20. /* 
  21.  * Main
  22.  */
  23. int main()
  24. {
  25.     int n;
  26.     while (1)
  27.     {
  28.         cout<<"Enter the integer n to find nth fibonnaci no.(0 to exit): ";
  29.         cin>>n;
  30.         if (n == 0)
  31.             break;
  32.         cout<<fibo_recur(n)<<endl;
  33.     }
  34.     return 0;
  35. }

$ 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

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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