Lecture 30 - Fancy Pattern - 3

A "Fancy Pattern - 3" is another visually appealing pattern that consists of numbers arranged in a specific way. This pattern also involves a combination of stars, spaces, and numbers to create a symmetrical design. Let's create a "Fancy Pattern - 3" using C++:

Here's the pattern for 5 rows:

markdownCopy code
        1
      2 3 2
    3 4 5 4 3
  4 5 6 7 6 5 4
5 6 7 8 9 8 7 6 5
  4 5 6 7 6 5 4
    3 4 5 4 3
      2 3 2
        1

Let's write a C++ program to generate the "Fancy Pattern - 3" based on the number of rows specified by the user:

cppCopy code
#include <iostream>

int main() {
    int rows;
    std::cout << "Enter the number of rows: ";
    std::cin >> rows;

    // Upper part of the pattern
    for (int i = 1; i <= rows; i++) {
        // Print spaces before the numbers
        for (int space = 1; space <= (rows - i) * 2; space++) {
            std::cout << " ";
        }

        // Print the first set of numbers in increasing order
        for (int num = i; num <= i * 2 - 1; num++) {
            std::cout << num << " ";
        }

        // Print the second set of numbers in decreasing order
        for (int num = i * 2 - 3; num >= i; num--) {
            std::cout << num << " ";
        }

        std::cout << std::endl;
    }

    // Lower part of the pattern
    for (int i = rows - 1; i >= 1; i--) {
        // Print spaces before the numbers
        for (int space = 1; space <= (rows - i) * 2; space++) {
            std::cout << " ";
        }

        // Print the first set of numbers in increasing order
        for (int num = i; num <= i * 2 - 1; num++) {
            std::cout << num << " ";
        }

        // Print the second set of numbers in decreasing order
        for (int num = i * 2 - 3; num >= i; num--) {
            std::cout << num << " ";
        }

        std::cout << std::endl;
    }

    return 0;
}

Example output for rows = 5:

markdownCopy code
        1
      2 3 2
    3 4 5 4 3
  4 5 6 7 6 5 4
5 6 7 8 9 8 7 6 5
  4 5 6 7 6 5 4
    3 4 5 4 3
      2 3 2
        1

In the code above, we use two nested loops to print the upper and lower parts of the pattern. The outer loop i controls the number of rows, and the inner loop space prints the spaces before the numbers. The first set of numbers is printed in increasing order, and the second set of numbers is printed in decreasing order to create the "Fancy Pattern - 3."

Feel free to experiment with different values of rows to generate "Fancy Pattern - 3" of different sizes.

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