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. }

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$ 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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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn