C-Program For Fibonacci series using Different loops

Code 1:Fibonacci series in c using while loop

#include<stdio.h>

int main(){

    int k=2,n;

    long int i=0,l,j=1,f;

    printf("Enter the number range:");

    scanf("%d",&n);

    printf("Fibonacci series is: %ld %ld",i,j);

    while(k<n){

         f=i+j;

         i=j;

         j=f;

         printf(" %ld",j);

          k++;

    }

  

    return 0;

}

output:

Enter the number range: 9

FIBONACCI SERIES: 0 1 1 2 3 5 8 13 21 

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Code 2: Fibonacci series using array in c

#include<stdio.h>

int main(){

    int i,n;

    long int arr[40];

    printf("Enter the number range: ");

    scanf("%d",&n);

    arr[0]=0;

    arr[1]=1;

    for(i=2;i<n;i++){

         arr[i] = arr[i-1] + arr[i-2];

    }

    printf("Fibonacci series is: ");

    for(i=0;i<n;i++)

         printf("%ld ",arr[i]);

  

    return 0;

}

output:

Enter the number range: 9

FIBONACCI SERIES: 0 1 1 2 3 5 8 13 21 ____________________________________________________________

Code 3: Fibonacci series in c using for loop

#include<stdio.h>

int main(){

    int k,n;

    long int i=0,l,j=1,f;

  

    printf("Enter the number range:");

    scanf("%d",&n);

    printf("FIBONACCI SERIES: ");

    printf("%ld %ld",i,j);

    for(k=2;k<n;k++)
{

         f=i+j;

         i=j;

         j=f;

         printf(" %ld",j);

    }

  

    return 0;

}

output:

Enter the number range: 9

FIBONACCI SERIES: 0 1 1 2 3 5 8 13 21 

____________________________________________________________ 

Code 4: Sum of Fibonacci series in c

#include<stdio.h>

int main(){

    int k,n;

    long int i=0,j=1,f;

    long int sum = 1;

    printf("Enter the number range: ");

    scanf("%d",&n);

    for(k=2;k<n;k++){

         f=i+j;

         i=j;

         j=f;

         sum = sum + j;

    }

    printf("Sum of Fibonacci series is: %ld",sum);

  

    return 0;

}

output:

Enter the number range:5

FIBONACCI SERIES: 7