九九乘法表

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 int i = 1, j = 1;

            //混乱型乘法表

            //for (i = 1; i <= 9; i++)
            //{
            //    for (j = 1; j <= 9; j++)
            //    {
            //        Console.WriteLine("{0} * {1} = {2}", i, j, i * j);
            //    }
            //}
           
            //长方形乘法表

            //for ( i = 1; i < 10; i++)
            //{
            //    for (j = 1; j < 10; j++)
            //    {
            //        Console.Write(j);
            //        Console.Write("*");
            //        Console.Write(i);
            //        Console.Write("=");
            //        Console.Write(i * j+" ");
            //        if (i*j<10)
            //        {
            //            Console.Write(" ");
            //        }
            //    }
            //    Console.WriteLine();
            //}

            //正直角三角形乘法表1

            for (i = 1; i < 10; i++)
            {
                for (j = 1; j < i + 1; j++)
                {
                    Console.Write(j);
                    Console.Write("*");
                    Console.Write(i);
                    Console.Write("=");
                    Console.Write(i * j + " ");
                    if (i * j < 10)
                    {
                        Console.Write(" ");
                    }

                }
                Console.WriteLine();
            }

            //正直角三角形乘法表2

            //for (i = 1; i < 10; i++)
            //{
            //    for (j = i; j > 0; j--)
            //    {
            //        Console.Write(j);
            //        Console.Write("*");
            //        Console.Write(i);
            //        Console.Write("=");
            //        Console.Write(i * j + " ");
            //        if (i * j < 10)
            //        {
            //            Console.Write(" ");
            //        }

            //    }
            //    Console.WriteLine();
            //}


            //倒直角三角形乘法表
         
            //for (i = 9; i >0; i--)
            //{
            //    for (j = i; j > 0; j--)
            //    {
            //        Console.Write(j);
            //        Console.Write("*");
            //        Console.Write(i);
            //        Console.Write("=");
            //        Console.Write(i * j + " ");
            //        if (i * j < 10)
            //        {
            //            Console.Write(" ");
            //        }

            //    }
            //    Console.WriteLine();
            //}
            //for (i = 9; i > 0; i--)
            //{
            //    for (j = i; j > 0; j--)
            //    {
            //        Console.Write(j);
            //        Console.Write("*");
            //        Console.Write(i);
            //        Console.Write("=");
            //        Console.Write(i * j + " ");
            //        if (i * j < 10)
            //        {
            //            Console.Write(" ");
            //        }

            //    }
            //    Console.WriteLine();
            //}


          

            Console.ReadKey();

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