C# 输出 九九乘法口诀

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

namespace Consolezeng
{
    class Program
    {  
        /*************输出九九乘法口诀***************/
        static void Main(string[] args)
        {
            string str = " ";
            int i;
            int j;
            int sum;
            for (i = 1; i < 10; i++)
            {
                for (j = 1; j <=i; j++)
                {
                    sum = i * j;
                    Console.Write(j);
                    Console.Write("*");
                    Console.Write(i);
                    Console.Write("=");
                    Console.Write(sum);
                    Console.Write(str);
                }
                Console.WriteLine();
            }
            Console.Read();
        }
    }
}