2016.7.24C#基础

（一）、打印三角形

---

1.打印一个直角在左上的三角形

            Console.Write("输入一个数n=");
            int n=int.Parse(Console.ReadLine());

            for (int i = 1; i <= n; i++)       //从1开始递增，到n结束
            {
                for (int j = i; j <=n; j++)     
                {
                    Console.Write("●");
                }
                Console.WriteLine();
            }
            Console.ReadLine();

2.打印一个直角在左下角的三角形

            Console.Write("输入一个数n:");
            int n = int.Parse(Console.ReadLine());
            for (int i = 1; i <= n; i++)

            {
                for (int j = 1; j <= i; j++)
                {
                    Console.Write("●");
                }
                Console.WriteLine();
            }
            Console.ReadLine();