How to calculate fibonacci series (C++)

Fibonacci series

fibonacciSeries() calculates the fibonacci series and it takes 3 parameter:

num1 is the first starting number of the fibonacci series.

num2 is the second starting number of the fibonacci series.

len is the length of the fibonacci series.

Code

#include "stdafx.h"

#include "iostream"

#include "conio.h"

#include "iomanip"

using namespace std;

void fibonacciSeries(int num1,int num2,int len)

{

unsigned long sum;

      

 for(int n=0;n<len-1;n++)

 {

  if(n==0)

   cout<<setw(5)<<num1<<setw(5)<<num2<<setw(5);

  else

  {

   sum=num1+num2;

   cout<<sum<<setw(5);

   num1=num2;

   num2=sum;

  }

 }

}

int main()

{

       fibonacciSeries (  0 ,  1 , 10 ) ; cout<<endl;

       fibonacciSeries (  1 ,  1 , 10 ) ; cout<<endl;

       fibonacciSeries ( 10 , 11 , 10 ) ; cout<<endl;

       fibonacciSeries ( 15 , 16 , 10 ) ; cout<<endl;

       _getche();

       return 0;

}

Output

    0    1    1    2    3    5    8   13   21   34

    1    1    2    3    5    8   13   21   34   55

   10   11   21   32   53   85  138  223  361  584

   15   16   31   47   78  125  203  328  531  859