C++ Exercises: Print the Floyd's Triangle

C++ For Loop: Exercise-43 with Solution

Write a C++ program to print Floyd's Triangle.

Sample Solution:

C++ Code :

#include <iostream> // Include the input/output stream library
using namespace std; // Using standard namespace

int main() // Main function where the execution of the program starts
{
    int i, j, n, p, q; // Declare integer variables i, j, n, p, and q

    // Display message asking for input
    cout << "\n\n Print the Floyd's Triangle:\n";
    cout << "--------------------------------\n";
    cout << " Input number of rows: ";
    cin >> n; // Read input for the number of rows from the user

    // Loop to print Floyd's Triangle pattern with alternating 0 and 1
    for (i = 1; i <= n; i++) // Loop for the number of rows
    {
        if (i % 2 == 0) // Check if the current row number is even
        {
            p = 1; // Assign 1 to 'p' if the row number is even
            q = 0; // Assign 0 to 'q' if the row number is even
        }
        else // If the current row number is odd
        {
            p = 0; // Assign 0 to 'p' if the row number is odd
            q = 1; // Assign 1 to 'q' if the row number is odd
        }

        for (j = 1; j <= i; j++) // Loop to print numbers in each row
        {
            if (j % 2 == 0) // Check if the current position in the row is even
                cout << p; // Print 'p' if the position is even
            else
                cout << q; // Print 'q' if the position is odd
        }

        cout << endl; // Move to the next line after each row is printed
    }
}

Sample Output:

 Print the Floyd's Triangle:                                           
--------------------------------                                       
 Input number of rows: 5                                               
1                                                                      
01                                                                     
101                                                                    
0101                                                                   
10101

Flowchart:

C++ Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a program in C++ to display the pattern like a pyramid using asterisk and each row contain an odd number of asterisks.
Next: Write a program in C++ to display the pattern like a diamond.