Fibonacci series Program in C | C program to generate Fibonacci Series up to given Number

by Venkat · November 15, 2014

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Description :

A series of whole numbers in which each number is the sum of the two preceding numbers. Beginning with 0 and 1, the sequence of Fibonacci numbers would be 0,1,1, 2, 3, 5, 8, 13, 21, 34, etc.

formula to calculate Fibonacci Series n = n(-1) + n(-2),

where the n(-1) means “the last number before n in the series” and n(-2) refers to “the second last one before n in the series.”

Program :

#include<stdio.h>
int main()
{
        int i,j,k,num;
        printf(“Enter any positive Number : “);
        scanf(“%d”,&num);
        /* because No Fibonacci series for Negative
         * Numbers,. please enter more than 0. ex: 1,50,100.
         */
        if(num > 0)
        {
                printf(“Fibonacci series is :”);
                i=0;
                j=1;
                printf(” %d %d “,i,j);
                k=i+j;
                while(k <= num)
                {
                        printf(“%d “,k);
                        i=j;
                        j=k;
                        k=i+j;
                }
        }
        else
        {
                printf(“No fibonacci series for Negative Numbersn“);
        }
        printf(“n“);
}