C++ Exercises: Display the first 10 Lucus numbers

C++ Numbers: Exercise-14 with Solution

Write a program in C++ to display the first 10 Lucus numbers.

Visual Presentation:

Sample Solution:

C++ Code :

#include <iostream> // Include the input/output stream library
#include <cmath>    // Include the math library for mathematical operations
using namespace std; // Use the standard namespace

int main() 
{
    // Display a message indicating to find the first 10 Lucas numbers
    cout << "\n\n Find the first 10 Lucas numbers: \n";
    cout << " -------------------------------------\n";
    // Display a message indicating the result will be the first 10 Lucas numbers
    cout << " The first 10 Lucas numbers are: "<<endl;

    int n = 10; // Define the count of Lucas numbers to find
    int n1 = 2, n2 = 1, n3; // Initialize the first two Lucas numbers

    // Check if the input count of numbers is greater than 1
    if (n > 1) 
    {
        // Display the first two Lucas numbers
        cout << n1 << " " << n2 << " ";

        // Loop to generate and display the subsequent Lucas numbers
        for (int i = 2; i < n; ++i) 
        {
            n3 = n2; // Store the current value of n2 in n3
            n2 += n1; // Calculate the next Lucas number by adding n1 to n2
            n1 = n3; // Set the new value of n1 as the previous value of n2
            cout << n2 << " "; // Display the next Lucas number
        }
        cout << endl; // Move to a new line for better readability
    } 
    else if (n == 1) // Check if the input count is 1
    {
        cout << n2 << " "; // If so, display the first Lucas number
        cout << endl; // Move to a new line for better readability
    } 
    else 
    { 
        // If the input is less than 1, display a message to input a positive number
        cout << "Input a positive number." << endl;
    }
}

Sample Output:

Find the first 10 Lucus numbers:                                                                    
 -------------------------------------                                                               
 The first 10 Lucus numbers are:                                                                     
2 1 3 4 7 11 18 29 47 76   

Flowchart:

C++ Code Editor:

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