Example: Print Star Pattern without using loop in C++

C
C++
C#
Java
Python
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// Print Star Pattern without using loop in C++
#include <bits/stdc++.h>
#include <cmath>
using namespace std;

int i = 1, r = 1;

// It's the recursive function
// to print the star pattern
void starPattern(int n) {
    ((int) sqrt(pow((i - (2 * n - 1) *(r - 1) - n), 2)) < r) ? cout << "*" : cout << " ";

    if ((i - (2 * n - 1) * (r - 1)) % (2 * n - 1) == 0) {
        cout << "\n";
        r++;
    }

    if (i++ < n * (2 * n - 1))
        starPattern(n);
}

// It's the driver function
int main() {
    // size of the pattern
    int x;

    cout << "-----Enter the size of the pattern-----\n";
    cin >> x;

    // This will print the pattern
    starPattern(x);
    return 0;
}