C++ Program to show Fibonacci Series

Write a C++ program , that prints all the Fibonacci numbers , which are smaller than or equal to a number k(k≥2) ,which was entered by the user.

The Fibonacci numbers are a sequence of numbers,where then-th number of Fibonacci is defined as:
Fib(0)=0,
Fib(1)=1,
Fib(n)=Fib(n-1)+Fib(n-2) Usage :> Input of k:21 > Fibonacci numbers<=21:01123581321

Solution 1 –

The solution below will answer following questions :
1. Write a program to generate the Fibonacci series in C++.
2. Fibonacci series in C++ using for loop.
3. How to print Fibonacci series in C++.
4. Write a program to print Fibonacci series inC++.
5. How to find Fibonacci series in C++ programming.
6. Basic C++ programs Fibonacci series.

#include<iostream>

using namespace std;


int main (void)
{

  int r=0,a=0,n,b=1,i,c;
  char redo;
  do
  {
    a=0;
    b=1;
    cout<<"enter the the value of n:";
    cin>> n;
    if(n>100){
      cout<<"enter some lessor value"<<endl;
    }
    else{
      cout<<a<<endl;
      for (i=0;i<=n;i++)
      {
        c=a+b;
        a=b;
        b=c;
        cout<<"serial no."<<i+1<<"==";
        cout<<a <<endl;
      }
      cout<<"enter y or Y to continue:";
      cin>>redo;
      cout<<endl<<endl;
    }
  }
  while(redo=='y'||redo=='Y');



  return 0;
}

Solution 2 –

If we want to Write a program to generate the Fibonacci series in C++ using recursion, the follow the solution below :

/**
  Fibonacci series in C++ using recursion by codebind.com
  */

#include <iostream>

int Fibonacci(int x) {
  if (x < 2){
    return x;
  }
  return (Fibonacci (x - 1) + Fibonacci (x - 2));
}

int main(void) {
  int number;
  std::cout << "Please enter a positive integer: ";
  std::cin >> number;
  if (number < 0)
    std::cout << "That is not a positive integer.\n";
  else
    std::cout << number << " Fibonacci is: " << Fibonacci(number) <<  std::endl;
  return 0;
}

Solution 3 –

The solution below will answer following questions :
1. Fibonacci series using array in C++
2. Fibonacci series program in C++ language
3. Source code of Fibonacci series inC++
4.Write a program to print Fibonacci series in C++

/**
  Fibonacci series in C++ using array by codebind.com
  */

#include <iostream>

int main(void) {
  int i,number;
  long int arr[40];

  std::cout << "Enter the number : "<< std::endl;
  std::cin >> number;

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

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

  std::cout << "Fibonacci series is: ";
  for(i=0; i< number; i++)
    std::cout << arr[i] << std::endl;
  return 0;
}