C#版杨辉三角

using System;

namespace 杨辉三角
{
    /**//// <summary>
    /// Class1 的摘要说明。
    /// </summary>
    class Class1
    {
        /**//// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main(string[] args)
        {
            Console.WriteLine("input the rownum:");
            int r=int.Parse(Console.ReadLine());
            int[,] a=new int[r+1,r+1];
            int i=0;int j=0;
            for(;i<r;i++)
            {
                j=0;
                for(;j<=i;j++)
                {
                    if(j==0||j==i)
                    {
                        a[i,j]=1;
                    }
                    else 
                    {
                        a[i,j]=a[i-1,j-1]+a[i-1,j];
                    }
                    Console.Write("{0} \t",a[i,j]);
                }
                    Console.WriteLine();
            }
            Console.Read();
        }
    }
}