C++ Program to print the Fibonacci series by using prefix increment unary operator

Program -

#include<iostream.h>

#include<conio.h>

class fibbo

{

Private:

unsigned long int i,j,k;

public:

fibbo()

{

i=0;j=1;k=i+j;

display();

{

cout<<i<<j;

}}

display()

{

cout<<"\n"<<k;

return(k);

}

void operator++()

{

i=j;j=k;k=i+j;

}

~fibbo()

{

cout<<"distroctor invoked";

}};

void main()

{

fibbo m;

int n,i;

cout<<"\n enter the value of n:";

cin>>n;

m.display();

for(i=1;i<n;i++)

{

m.display();

++m;

}

getch();

}

Output -

enter the value of n:9

1

1

2

3

5

8

13

21

34