Example: User-Defined Solid Diamond Pattern in C++

// User-Defined Solid Diamond Pattern
#include <iostream>
using namespace std;

int main() {
    int size;

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

    // Step 2: Input validation (optional but good practice)
    if (size <= 0) {
        cout << "Size must be a positive integer." << endl;
        return 1; // Indicate an error
    }

    // Step 3: Print the upper half of the diamond
    for (int i = 1; i <= size; i++) {
        // Print leading spaces
        for (int j = 1; j <= size - i; j++) {
            cout << " ";
        }
        // Print stars
        for (int k = 1; k <= 2 * i - 1; k++) {
            cout << "*";
        }
        cout << endl;
    }

    // Step 4: Print the lower half of the diamond
    for (int i = size - 1; i >= 1; i--) {
        // Print leading spaces
        for (int j = 1; j <= size - i; j++) {
            cout << " ";
        }
        // Print stars
        for (int k = 1; k <= 2 * i - 1; k++) {
            cout << "*";
        }
        cout << endl;
    }

    return 0;
}