# C++ program to print Fibonacci series up to N using class

Submitted by Shubh Pachori, on September 09, 2022

## Problem statement

Given the value of N, we have to print Fibonacci series up to n using the class and object approach.

Example:

```Input:
Enter n : 8

Output:
Fibonacci series upto 8 terms is 0,1,1,2,3,5,8,13,
```

## C++ code to print Fibonacci series up to N using the class and object approach

```#include <iostream>
using namespace std;

// creating a class
class Fibonacci {
// private data member
private:
int number;

// public member function
public:
// getN() function to insert n
void getN() {
cout << "Enter n : ";
cin >> number;
}

// fibonacci() function to print
// fibonacci series upto n
void fibonacci() {
// initialize first and second terms
int term_1 = 0, term_2 = 1;

// initialize the next term (3rd term)
int term_3 = term_1 + term_2;

// print the base line
cout << "Fibonacci series upto " << number << " terms is ";

// print the first two terms t1 and t2
cout << term_1 << "," << term_2 << ",";

// for loop to print fibonacci series
// upto entered term
for (int index = 3; index <= number; index++) {
// print third term
cout << term_3 << ",";

// copy previous term to second previous term
term_1 = term_2;

// copy just last term to the previous one
term_2 = term_3;

// now make a new term with the updated terms
term_3 = term_1 + term_2;
}
}
};

int main() {
// creating object
Fibonacci F;

// calling getN() function to insert n
F.getN();

// calling fibonacci() function to
// print fibonacci series
F.fibonacci();

return 0;
}
```

### Output

```Enter n : 10
Fibonacci series upto 10 terms is 0,1,1,2,3,5,8,13,21,34,
```

### Explanation

In the above code, we have created a class Fibonacci, one int type data member number to store the number n, and public member functions getN() and fibonacci() to store n and to print Fibonacci series upto n.

In the main() function, we are creating an object F of class Fibonacci, reading a number n by the user using getN() function, and finally calling the fibonacci() member function to print the Fibonacci series up to n. The fibonacci() function contains the logic to print the Fibonacci series up to n.