正Man's World

using System;
using System.Collections.Generic;
using System.Text;

namespace starConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            three(3);
            rin(5);
            subset(1,3);
            Console.Read();
        }
        static void subset(int s,int e) {
            int i;
            //Console.Write(" ->s:" + s +"e:" + e);
            if (s != e)
            {
                subset(s, e - 1);
                subset(s + 1, e);
               
                Console.Write("{");
                for (i = s; i                 {
                    Console.Write(i);
                    if (i != e) {
                        Console.Write(",");
                    }
                }
                Console.Write("} ");
               
            }
            else {
                Console.Write("{" + s + "} ");
            }

        }
       
//三角形
static void three(int n) {
            int i,j;
            for(i=0;i                for(j=0;j                    Console.Write(" ");
                }
                for (j = 0; j                 {
                    Console.Write("*");
                }
                Console.WriteLine();
            }
           
        }
        

//菱形
static void rin(int n) {
            int i, j;
            for (i = 0; i             {
                if (i                 {
                    for (j = 0; j                     {
                        Console.Write(" ");
                    }
                    for (j = 0; j                     {
                        Console.Write("*");
                    }
                   
                    Console.WriteLine();
                }
                else {
                    for (j = 0; j                     {
                        Console.Write(" ");
                    }
                    for (j = 0; j                     {
                        Console.Write("*");
                    }
                    Console.WriteLine();
                }
            }
        }
    }
}