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Sunday, 21 July 2013

C program to generate fibonacci series using recursion

Write a C program to generate Fibonacci series using recursion.


  #include <stdio.h>

  /* prints first n fibonacci numbers */
  void fibonacci(int *num1, int *num2, int *count, int n) {
        int temp;
        if (*count < n) {
                printf("%d ", *num1);
                temp = *num1 + *num2;
                *num1 = *num2;
                *num2 = temp;
                *count = *count + 1;
                /* recursive call */
                fibonacci(num1, num2, count, n);
        }
        return;
  }

  int main() {
        int num1 = 0, num2 = 1, n, count = 0;

        /* get the number of fibonacci numbers needed */
        printf("Enter the value for n:");
        scanf("%d", &n);

        /* prints first n fibonacci numbers */
        printf("Fibonacci Series:\n");
        fibonacci(&num1, &num2, &count, n);
        printf("\n");

        return 0;
  }



  Output:
  jp@jp-VirtualBox:~/$ ./a.out
  Enter the value for n:10
  Fibonacci Series:
  0 1 1 2 3 5 8 13 21 34


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