Write a program to find sum of Fibonacci series using function.

Dr. A.P.J. Abdul Kalam Technical University, Lucknow

KCS151 / KCS251 Programming for Problem Solving - Using C Language

Lab Exercises

18. Write a program to find the sum of the Fibonacci series using a function.

/*

 File: Prgrm18.c

 Author: Aditya Saini

 Date: Jan 17, 2021

 Description: Program to find the sum of the Fibonacci series using a function.

*/

#include <stdio.h>

int sum_of_fibona (int);

int main (void)

{

     int terms;

     int sum;

     //Input number of terms

     printf ("Input number of terms: ");

     scanf ("%d", &terms);

     //Function call

     sum = sum_of_fibona (terms);

     //Print result

     printf ("Sum of Fibonacci Series: %d", sum);

     return 0;

};

int sum_of_fibona (int terms)

{

     int previous, current, next;

     int sum;

     int i;

     previous = 0;

     current = 1;

     if (terms >= 3)

     {

          printf ("%d terms of Fibonacci Series: %d %d ", terms, previous, current);

          sum = 1;

          for (i = 3; i <= terms; i++)

          {

               next = previous + current;

               printf ("%d ", next);

               sum = sum + next;

               previous = current;

               current = next;

          }

          printf ("\n");

     }

     else if (terms == 2)

     {

          sum = 1;

          printf ("%d terms of Fibonacci Series: %d %d\n", terms, previous, current);

     }

     else

          sum = 0;

     //Return sum

     return sum;

};

Output

Input number of terms: 10

10 terms of Fibonacci Series: 0 1 1 2 3 5 8 13 21 34 

Sum of Fibonacci Series: 88