C++ Exercises: Display the first n terms of Fibonacci series

Last update on August 14 2025 12:56:17 (UTC/GMT +8 hours)

27. Display the First n Terms of the Fibonacci Series

Write a program in C++ to display the first n terms of the Fibonacci series.

Visual Presentation:

C++ Exercises: Display the first n terms of Fibonacci series

Sample Solution:-

C++ Code :

#include <iostream> // Including input-output stream header

using namespace std; // Using standard namespace to avoid writing std::

int main() // Start of the main function
{
    int prv = 0, pre = 1, trm, i, n; // Declaration of integer variables 'prv' (previous term), 'pre' (current term), 'trm' (next term), 'i' (loop counter), 'n' (number of terms)

    cout << "\n\n Display the first n terms of Fibonacci series:\n"; // Displaying a message on the console
    cout << "---------------------------------------------------\n";
    cout << " Input number of terms to display: "; // Prompting the user to input the number of terms
    cin >> n; // Reading the input value as the number of terms

    cout << " Here is the Fibonacci series up to " << n << " terms: " << endl; // Displaying a message indicating the number of terms for the Fibonacci series
    cout << prv << " " << pre; // Displaying the first two terms of the Fibonacci series

    for (i = 3; i <= n; i++) // Loop to generate and display the Fibonacci series from the third term
    {
        trm = prv + pre; // Calculating the next term of the Fibonacci series
        cout << " " << trm; // Displaying the next term of the Fibonacci series
        prv = pre; // Updating the previous term to the current term
        pre = trm; // Updating the current term to the next term
    }
    cout << endl; // Printing a new line after displaying the series
}

Sample Output:

 Display the first n terms of Fibonacci series:                        
---------------------------------------------------                    
 Input number of terms to  display: 10                                 
 Here is the Fibonacci series upto  to 10 terms:                       
0 1 1 2 3 5 8 13 21 34

Flowchart:

For more Practice: Solve these Related Problems:

Write a C++ program to generate the Fibonacci sequence up to n terms using recursion.
Write a C++ program that prints the Fibonacci series for a given n using iterative loops and stores the results in an array.
Write a C++ program to display the Fibonacci series up to n terms and also print the nth Fibonacci number.
Write a C++ program that uses a while loop to generate and display the first n numbers in the Fibonacci sequence.

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