Example: Number Diamond Pattern in C++

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

int main() {
    int size;
    cout << "Enter the size of the diamond (e.g., 4 for a 7-row diamond): ";
    cin >> size;

    // Upper half of the diamond (including the widest row)
    for (int i = 1; i <= size; i++) {
        // Step 1: Print leading spaces
        for (int j = 1; j <= size - i; j++) {
            cout << " ";
        }
        // Step 2: Print increasing numbers
        for (int k = 1; k <= i; k++) {
            cout << k;
        }
        // Step 3: Print decreasing numbers
        for (int k = i - 1; k >= 1; k--) {
            cout << k;
        }
        cout << endl; // Move to the next line
    }

    // Lower half of the diamond (excluding the widest row)
    for (int i = size - 1; i >= 1; i--) {
        // Step 1: Print leading spaces
        for (int j = 1; j <= size - i; j++) {
            cout << " ";
        }
        // Step 2: Print increasing numbers
        for (int k = 1; k <= i; k++) {
            cout << k;
        }
        // Step 3: Print decreasing numbers
        for (int k = i - 1; k >= 1; k--) {
            cout << k;
        }
        cout << endl; // Move to the next line
    }

    return 0;
}