Example: Rhombus Diamond Pattern in C++

// Rhombus Diamond Pattern
#include <iostream>
using namespace std;

int main() {
    int size;

    // Step 1: Get user input for the size of the diamond
    cout << "Enter the size for the diamond (e.g., 3 for a 5-row diamond): ";
    cin >> size;

    if (size <= 0) {
        cout << "Size must be a positive integer." << endl;
        return 1;
    }

    // Step 2: Print the top half of the diamond (including the middle row)
    for (int i = 0; i < size; ++i) { // Outer loop for rows
        // Print leading spaces
        for (int j = 0; j < size - 1 - i; ++j) {
            cout << " ";
        }
        // Print stars
        for (int k = 0; k < 2 * i + 1; ++k) {
            cout << "*";
        }
        cout << endl; // Move to the next line after each row
    }

    // Step 3: Print the bottom half of the diamond (excluding the middle row)
    for (int i = 0; i < size - 1; ++i) { // Outer loop for rows (size-1 rows)
        // Print leading spaces
        for (int j = 0; j < i + 1; ++j) {
            cout << " ";
        }
        // Print stars
        for (int k = 0; k < 2 * (size - 1 - i) - 1; ++k) {
            cout << "*";
        }
        cout << endl; // Move to the next line after each row
    }

    return 0;
}