C++ Exercises: Display the pattern power of 2, triangle

Last update on December 20 2024 12:23:23 (UTC/GMT +8 hours)

Write a program in C++ to display the pattern like pyramid, power of 2.

Sample Solution:

C++ Code :

#include <iostream> // Include the input/output stream library
#include <math.h>   // Include math library for pow() function
using namespace std; // Using standard namespace

int main() // Main function where the execution of the program starts
{
    int i, j, spc, n, mm, d = 1, k; // Declare integer variables i, j, spc, n, mm, d, k

    cout << "------------------------------------------------------\n"; // Display a separator line
    cout << " Input the number of rows: ";
    cin >> n; // Read input for the number of rows from the user

    // Loop to print the first line (for the value 2^0)
    for (i = 1; i <= n * 2 + 2 + 5; i++) // Extra spaces for margin from the left
        cout << " "; // Print spaces for formatting
    cout << pow(2, 0) << endl; // Print the value 2^0 followed by a newline

    for (i = 1; i < n; i++) // Loop for the remaining lines
    {
        // Loop to print spaces before the numbers
        for (k = 1; k <= n * 2 - d + 5; k++) // Extra spaces for margin from the left
        {
            cout << " "; // Print spaces for formatting
        }

        // Loop to print numbers up to the middle
        for (j = 0; j < i; j++) // Loop from 0 to i
        {
            mm = pow(2, j); // Calculate the value 2 raised to the power of j
            cout << mm << "  "; // Print the calculated value followed by two spaces
        }

        // Loop to print numbers after the middle to the end
        for (j = i; j >= 0; j--) // Loop from i to 0
        {
            mm = pow(2, j); // Calculate the value 2 raised to the power of j
            cout << mm << "  "; // Print the calculated value followed by two spaces
        }

        d = d + 3; // Increment the value of 'd' by 3 for formatting
        cout << endl; // Move to the next line after each row is printed
    }
}

Sample Output:

Input the number of rows: 5
                 1
              1  2  1
           1  2  4  2  1
        1  2  4  8  4  2  1
	1	2  4  8  16  8  4  2  1

Flowchart:

C++ Code Editor:

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