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C++ Program to print Fibonacci Series using Class template

Last Updated : 23 Jun, 2022

Given a number n, the task is to write a program in C++ to print the n-terms of Fibonacci Series using a Class template The Fibonacci numbers are the numbers in the following integer sequence.

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ……..

Examples:

Input: n = 2
Output: 0, 1

Input: n = 9
Output: 0, 1, 1, 2, 3, 5, 8, 13, 21

Approach:

Create a class for the Fibonacci Series
Take the first two terms of the series as public members a and b with values 0 and 1, respectively.
Create a generate() method in this class to generate the Fibonacci Series.
Create an object of this class and call the generate() method of this class using that object.
The Fibonacci Series will get printed.

Below is the implementation of the above approach:

CPP

// C++ Program to print Fibonacci 
// Series using Class template 
 
#include <bits/stdc++.h> 
using namespace std; 
 
// Creating class for Fibonacci. 
class Fibonacci { 
 
    // Taking the integers as public. 
public: 
    int a, b, c; 
    void generate(int); 
}; 
 
void Fibonacci::generate(int n) 
{ 
    a = 0; 
    b = 1; 
 
    cout << a << " " << b; 
 
    // Using for loop for continuing 
    // the Fibonacci series. 
    for (int i = 1; i <= n - 2; i++) { 
 
        // Addition of the previous two terms 
        // to get the next term. 
        c = a + b; 
        cout << " " << c; 
 
        // Converting the new term 
        // into an old term to get 
        // more new terms in series. 
        a = b; 
        b = c; 
    } 
} 
 
// Driver code 
int main() 
{ 
    int n = 9; 
 
    Fibonacci fib; 
    fib.generate(n); 
    return 0; 
} 

Output:

0 1 1 2 3 5 8 13 21

Time Complexity: O(n)

Auxiliary Space: O(1)

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