这题怎么做啊大家帮下忙

Question

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

Answer 1

   for (int i = 0; i < 5; i++)
        {
            for (int n = 0; n < 2 * i - 1; n++)
            {
                Response.Write("*");
            }
            Response.Write("<br>");
        }
        for (int i = 5; i > 0; i--)
        {
            for (int n = 0; n < 2 * i - 1; n++)
            {
                Response.Write("*");
            }
            Response.Write("<br>");
        }这样可以不

Answer 2

用个笨办法吧int[] vec = { 1, 3, 5, 7 };
                for (int i = 0; i < vec.Length; i++)
                {
                    int j = vec[i];
                        switch (j)
                        {
                            case 1:
                                Console.WriteLine("*");
                                break;
                            case 3:
                                Console.WriteLine("***");
                                break;
                            case 5:
                                Console.WriteLine("*****");
                                break;
                            case 7:
                                Console.WriteLine("*******");
                                break;
                            default:
                                Console.WriteLine("");
                                break;
                        }
                }
                for (int i = vec.Length - 1; i > -1; i--)
                {
                    if(i>0)
                    {
                        int j = vec[i - 1];
                            switch (j)
                            {
                                case 1:
                                    Console.WriteLine("*");
                                    break;
                                case 3:
                                    Console.WriteLine("***");
                                    break;
                                case 5:
                                    Console.WriteLine("*****");
                                    break;
                                case 7:
                                    Console.WriteLine("*******");
                                    break;
                                default:
                                    Console.WriteLine("");
                                    break;
                            }
                    }
                }输出结果就是你要的

Answer 3

//增加
            int max=3;
            for(int i=1;i<max;i+=2)
            {
            string s=new string('*',i);
            Console.WriteLine ( s );
            }
            //减少
            for ( int i=max -2 ; i > 0 ; i -= 2 )
            {
                string s=new string ( '*' , i );
                Console.WriteLine ( s );
            }

Answer 4

//增加
            int max=7;
            for ( int i=1 ; i < max ; i += 2 )
            {
                string s=new string ( '*' , i );
                Console.WriteLine ( s );
            }
            //减少
            for ( int i=max -2 ; i > 0 ; i -= 2 )
            {
                string s=new string ( '*' , i );
                Console.WriteLine ( s );
            }

Answer 5

 //增加
            int max=7;
            for ( int i=1 ; i <= max ; i += 2 )
            {
                string s=new string ( '*' , i );
                Console.WriteLine ( s );
            }
            //减少
            for ( int i=max -2 ; i > 0 ; i -= 2 )
            {
                string s=new string ( '*' , i );
                Console.WriteLine ( s );
            }

Answer 6

            int maxCount = 7; 
            for (int i = 1; i <= maxCount; i++)
            {
                for (int j = 0; j < i; j++)
                {
                    Console.Write("*");
                }
                Console.WriteLine();
            }
            for (int i = maxCount - 1; i >= 1; i--)
            {
                for (int j = 0; j < i; j++)
                {
                    Console.Write("*");
                }
                Console.WriteLine();
            }
            Console.ReadLine();