A start pattern using c++ language

pattern.cpp

#include <iostream>
using namespace std;

void pattern1(int n)
{
    int space = 0;

    for (int i = n; i >= 1; i--)
    {
        // stars
        for (int j = 1; j <= i; j++)
        {
            cout << "*";
        }

        // space
        for (int j = 0; j < space; j++)
        {
            cout << " ";
        }

        // stars
        for (int j = i; j >= 1; j--)
        {
            cout << "*";
        }

        cout << endl;
        space += 2;
    }
}

void pattern2(int n)
{
    int space = 2 * (n - 1);

    for (int i = 1; i <= n; i++)
    {
        // stars
        for (int j = 1; j <= i; j++)
        {
            cout << "*";
        }

        // space
        for (int j = 0; j < space; j++)
        {
            cout << " ";
        }

        // stars
        for (int j = i; j >= 1; j--)
        {
            cout << "*";
        }

        cout << endl;
        space -= 2;
    }
}

int main()
{
    int n;
    cin >> n;
    pattern1(n);
    pattern2(n);

    return 0;
}