Program in C++ to print nth number of fibonacci series Using Class

Program in C++ to print nth number of fibonacci series Using Class

FIRST METHOD

#include<iostream>
#include<conio.h>
 using namespace std;
  class Fibonacci
   {
     private:
      int n;
     public:
      Fibonacci(){}
      Fibonacci(int n1){ n=n1; }
      ~Fibonacci(){}
      void input()
       {
          cout<<"Enter a number:-";
          cin>>n; 
       }
       void Fibo()
         {
          int a=0,b=1,temp,i;
          for(i=1;i<=n;i++)
          {
            if(i==1)
              cout<<"0 ";
            else if(i==2)
             cout<<"1";
            else
             {
              temp=a+b;
              cout<<" "<<temp;
              a=b;
              b=temp;
             }
           }
       }
       
   };
   int main()
    {
     Fibonacci f1;
     f1.input();
     f1.Fibo();
     return 0;
 }

Output:-

SECOND METHOD

//Programming.OM
#include<iostream>
#include<conio.h>
 using namespace std;
 class Fibonacci
  {
    private:
      unsigned int n,f1,f2,f3;
    public:
         Fibonacci(){
             f1=0;
             f2=1;
             f3=0;
         }
        void show()
         {
             cout<<"\t"<<f3;
         }
        void operator++(int)
         {
             f1=f2;
             f2=f3;
             f3=f1+f2;
         }

  };

   int main()
    {
        Fibonacci f1;
        int n;
        cout<<"Enter a number :";
        cin>>n;
        for(int i=0;i<n;i++)
        {
            f1.show();
            f1++;
        }
    return 0;
    getch();
    }

Output:-