C#基础第二天-作业答案-九九乘法表-打印星星

题一：九九乘法表的答案    

            //正三角
            for (int i = 1; i < 10; i++)
            {
                for (int j = 1; j <= i; j++)
                {
                    Console.Write("{0}*{1}={2} ", j, i, i * j);
                }
                Console.WriteLine();
            }
            Console.ReadLine();

            //倒三角
            for (int i = 9; i >= 1; i--)
            {
                for (int j = i; j >= 1; j--)
                {

                    Console.Write("{0}*{1}={2} ", i, j, i * j);  //不换行
                }
                Console.WriteLine(); //换行
            }
            Console.ReadLine();  

            反倒三角
            string sd = string.Empty;
            for (int i = 9; i >= 1; i--)
            {
                for (int j = i; j >= 1; j--)
                {
                    string k = "  ";
                    if (j * i > 9)
                    {
                        k = " ";
                    }
                    Console.Write("{0}*{1}={2}{3}", j, i, i * j, k);
                }
                Console.WriteLine();
                sd += "       ";
                Console.Write(sd);
            }
            Console.ReadLine();

题二:

            //星星图1
            Console.WriteLine("请输入您想看到的星星行数");
            int num = Convert.ToInt32(Console.ReadLine());
            for (int hang = 1; hang <= num; hang++)
            {
                string k = String.Empty;
                string x = String.Empty;
                for (int kong = 1; kong <= num - hang; kong++)
                {
                    k += " ";
                }
                for (int xing = 1; xing <= hang; xing++)
                {
                    x += "* ";
                }
                Console.WriteLine(k + x + k);
            }
            Console.ReadLine();

            //星星图(倒三角星星)
            Console.WriteLine("请输入您想看到的星星行数");
            int num = Convert.ToInt32(Console.ReadLine());
            for (int hang = 1; hang <= num; hang++)
            {
                string k = String.Empty;
                string x = String.Empty;
                for (int kong = 1; kong <= hang - 1; kong++)
                {
                    k += " ";
                }
                for (int xing = 1; xing <= num - hang + 1; xing++)
                {
                    x += "* ";
                }
                Console.WriteLine(k + x + k);
            }
            Console.ReadLine();

            ////星星图四
            Console.WriteLine("请输入您想看到的星星行数");
            int num = Convert.ToInt32(Console.ReadLine());
            int gg = num * 2;
            for (int hang = 1; hang <= num; hang++)
            {
                string k = String.Empty;
                string x = String.Empty;
                for (int kong = 1; kong <= gg - 2 * hang; kong++)
                {
                    k += " ";
                }
                for (int xing = 1; xing <= hang; xing++)
                {
                    x += "* ";
                }
                Console.WriteLine(k + x);
            }
            Console.ReadLine();

            //星星图（倒三角*）
            Console.WriteLine("请输入您想看到的星星行数");
            int num = Convert.ToInt32(Console.ReadLine());
            int gg = num * 2;
            for (int hang = 1; hang <= num; hang++)
            {
                string k = String.Empty;
                string x = String.Empty;
                for (int kong = 1; kong <= 2 * (hang - 1); kong++)
                {
                    k += " ";
                }
                for (int xing = 1; xing <= num - hang + 1; xing++)
                {
                    x += "* ";
                }
                Console.WriteLine(k + x);
            }
            Console.ReadLine();

           //星星图（最终效果菱形）
            int a = int.Parse(Console.ReadLine());
            for (int i = 0; i <= a; i++)
            {
                string k = String.Empty;
                string x = String.Empty;
                for (int s = 0; s < a - i + 1; s++)
                {
                    k += " ";
                }
                for (int d = 0; d < 2 * i - 1; d++)
                {
                    x += "*";
                }
                Console.WriteLine(k + x + k);
            }
            for (int i = a - 1; i > 0; i--)
            {
                string k = String.Empty;
                string x = String.Empty;
                for (int s = 0; s < a - i + 1; s++)
                {
                    k += " ";
                }
                for (int d = 0; d < 2 * i - 1; d++)
                {
                    x += "*";
                }
                Console.WriteLine(k + x + k);
            }
            Console.ReadLine();
          //星星图（显示 图四效果/图五效果）最终显示图六效果

          for (int i = 1; i <= 4; i++)
            {
                for (int j = 1; j <= 4 - i; j++)
                {
                    Console.Write(" ");
                }
                for (int k = 1; k <= i; k++)
                {
                    Console.Write("*");
                }
                Console.WriteLine("");
            }
            for (int i = 4; i >= 1; i--)
            {
                for (int j = 1; j <= 4 - i; j++)
                {
                    Console.Write(" ");
                }
                for (int k = 1; k <= i; k++)
                {
                    Console.Write("*");
                }
                Console.WriteLine("");
            }
            Console.ReadKey();