C#这样的三角形怎么打

[98ELVISA]

求教在线等急！！

[Milo米啊米啊米]

上学的是的作业题，那个时候还是用c写的

[BloodyMandoo]

static void Main(string[] args)
        {
            Console.WriteLine("请输入行数：");
            int a = Convert.ToInt32(Console.ReadLine());
            for (int y = 1; y <=  a; y++)
            {
                for (int x = 1; x < 4 * (a+1); x++)
                {
                    if (x <= y || x > a + 1 && x - a + y <= a + 2 || x > 2 * (a+1) && x <= 3 * (a+1) && x - 2 * a <= y+2 || x > 3 * (a+1) && x - 3 * a + y > a+3)
                    {
                        Console.Write("*");
                    }
                    else
                    {
                        Console.Write(" ");
                    }
                   
                }
                Console.WriteLine();
            }
            Console.ReadKey();
        }

我觉得得用集合的思想解决问题。

[by_封爱]

Console.WriteLine("*                          ************************************                                        *");
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();
Console.WriteLine();

[xdashewan]

复制黏贴，Console.WriteLine打出来

[你隔壁王大爷]

static void Main(string[] args) { Console.Write("请输入行数："); int num = Convert.ToInt32(Console.ReadLine()); StringBuilder sb = new StringBuilder(); for (int i = 0; i < num; i++) { string str = "*"; for (int j = 0; j < i; j++) { str += "*"; } sb.AppendLine(str); } Console.WriteLine(sb.ToString()); Console.ReadKey(); }

[你隔壁王大爷]

static void Main(string[] args) { Console.Write("请输入行数："); int num = Convert.ToInt32(Console.ReadLine()); StringBuilder sb = new StringBuilder(); for (int i = num; i > 0; i--) { string str = ""; for (int j = i; j > 0; j--) { str += "*"; } sb.AppendLine(str); } Console.WriteLine(sb.ToString()); Console.ReadKey(); }

[xuzuning]

        static void Main(string[] args)
        {
            Console.Write("请输入行数：");
            int num = Convert.ToInt32(Console.ReadLine());
            for (int r = 0; r < num; r++)
            {
                for (int i = 0; i < num; i++) Console.Write(i <= r ? '*' : ' ');
                Console.Write(' ');
                for (int i = 0; i < num; i++) Console.Write(i < num - r ? '*' : ' ');
                Console.Write(' ');
                for (int i = 0; i < num; i++) Console.Write(i < r ? ' ' : '*');
                Console.Write(' ');
                for (int i = 0; i < num; i++) Console.Write(i < num - r - 1 ? ' ' : '*');
                Console.WriteLine("");
            }
        }