Butterfly Pattern

Lecture 33 - Butterfly Pattern

The Butterfly pattern is a symmetrical pattern that resembles the wings of a butterfly when displayed graphically. It consists of two triangular patterns facing each other, creating a mirror image. Here's an example of the Butterfly pattern with 5 rows:

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*        * **      ** ***    *** ****  **** ********** ********** ****  **** ***    *** **      ** *        *

Let's write a C++ program to generate the Butterfly pattern based on the number of rows specified by the user:

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#include <iostream> int main() {    int rows;    std::cout << "Enter the number of rows: ";    std::cin >> rows;    // Upper part of the butterfly    for (int i = 1; i <= rows; i++) {        for (int j = 1; j <= i; j++) {            std::cout << "*";        }        int spaces = 2 * (rows - i);        for (int j = 1; j <= spaces; j++) {            std::cout << " ";        }        for (int j = 1; j <= i; j++) {            std::cout << "*";        }        std::cout << std::endl;    }    // Lower part of the butterfly    for (int i = rows; i >= 1; i--) {        for (int j = 1; j <= i; j++) {            std::cout << "*";        }        int spaces = 2 * (rows - i);        for (int j = 1; j <= spaces; j++) {            std::cout << " ";        }        for (int j = 1; j <= i; j++) {            std::cout << "*";        }        std::cout << std::endl;    }    return 0; }

Example output for rows = 5:

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*        * **      ** ***    *** ****  **** ********** ********** ****  **** ***    *** **      ** *        *

In the code above, we use two nested loops to print the upper and lower parts of the Butterfly pattern. The outer loop i controls the number of rows, and the inner loop j prints the asterisks and spaces accordingly to create the symmetrical butterfly pattern.

Feel free to experiment with different values of rows to generate the Butterfly pattern of different sizes.