# C program to find Fibonacci series for a given number

CServer Side ProgrammingProgramming

Fibonacci Series is a sequence of numbers obtained by adding the two previous numbers.

Fibonacci series starts from two numbers f0 & f1.

The initial values of fo & f1 can be taken 0, 1 or 1, 1 Fibonacci series satisfies the following conditions −

fn = fn-1 + fn-2

## Algorithm

Refer to the algorithm for the Fibonacci series.

START
Step 1: Read integer variable a,b,c at run time
Step 2: Initialize a=0 and b=0
Step 3: Compute c=a+b
Step 4: Print c
Step 5: Set a=b, b=c
Step 6: Repeat 3 to 5 for n times
STOP

## Example

Following is the C program for the Fibonacci series using While Loop −

Live Demo

#include <stdio.h>
int main(){
int number, i = 0, Next, first = 0, second = 1;
printf("\n Please Enter the Range Number: ");
scanf("%d",&number);
while(i < number){
if(i <= 1){
Next = i;
}
else{
Next = first + second;
first = second;
second = Next;
}
printf("%d \t", Next);
i++;
}
return 0;
}

## Output

When the above program is executed, it produces the following result −

Please Enter the Range Number: 6
0 1 1 2 3 5