2

try { Console.WriteLine("请输入直角三角形高度"); int i = Convert.ToInt32(Console.ReadLine()); int a, b; for (a = 1; a <= i; a++)//行数 { for (b = i+1-a; b>=1; b--) { Console.Write("*"); } Console.WriteLine (); } } catch { } Console.ReadKey(); } } }