using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace SoloLearn { class Program { /*Please enter an integer(7-21). You may need to rotate the screen as the shape maybe too large. Visit my profile for more codes from me! */ static void square(int n) { char a = '#'; char b = '.'; char[,] arr = new char[n, n]; for (int row = 0; row < n; row++) { for (int column = 0; column < n; column++) { arr[row, column] = a; } } int r = 1; int c = n; int start = n - 1; int time = start; while (start > 2) { start -= 2; time += 2 * (start); } int t = n - 2; while (time > 1) { if (r != c) { if (c > r) { while (c > r) { c--; arr[r, c] = b; time--; } } if (c < r) { while (c < r) { c++; arr[r, c] = b; time--; } } } while (r == c) { if (r <= (n - 1) / 2) { for (int i = 0; i < t; i++) { arr[r, c] = b; if (r != c) { time--; } r++; } r--; t -= 2; } else { for (int i = 0; i < t; i++) { arr[r, c] = b; if (r != c) { time--; } r--; } r++; t -= 2; } } } for (int row = 0; row < n; row++) { for (int column = 0; column < n; column++) { Console.Write(arr[row, column] + " "); } Console.WriteLine(); } } static void Main(string[] args) { int.TryParse(Console.ReadLine(),out int num); if (num<7||num>21) { Console.WriteLine("Please enter an integer(7-21).\nSide length by default: 19\n"); num=19; } else{Console.WriteLine("Side length: "+num+"\n");} square(num); } } }

Double spiral