Hello Devs,

In this tutorial, we are going to learn C program to find Fibonacci series. A series of numbers in which each sequent number is sum of its two previous numbers is known as Fibonacci series and each numbers are called Fibonacci numbers.

Example of Fibonacci series:

0 , 1 ,1 , 2 , 3 , 5 , 8 , 13 , 21 , 34 , 55 ...

Here is a well-commented example you can understand and analyze.

``````# include <stdio.h>
int main(){
int k,r;
long int i=0l,j=1,f;

//Taking maximum numbers form user
printf("Enter the number range:");
scanf("%d",&r);

printf("FIBONACCI SERIES: ");
printf("%ld %ld",i,j); //printing firts two values.

for(k=2;k <r;k++){
f=i+j;
i=j;
j=f;
printf(" %ld",j);
}

return 0;
}``````

C program for Fibonacci series using array

``````#include<stdio.h>
int main(){

int i,range;
long int arr[40];

printf("Enter the number range: ");
scanf("%d",&range);

arr[0]=0;
arr[1]=1;

for(i=2;i<range;i++){
arr[i] = arr[i-1] + arr[i-2];
}

printf("Fibonacci series is: ");
for(i=0;i<range;i++)
printf("%ld ",arr[i]);

return 0;
}
``````

I hope this example helps you.