2018-12-20

        Console.WriteLine("请输入直角三角形行数");
        int n = Convert.ToInt32(Console.ReadLine());
        for (int i=1;i<= n;i++)
        {
            for (int j=1;j<=2*i-1;j++)
            {
                Console.Write("*");
            }
            Console.WriteLine();
        }
        Console.ReadKey();

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        Console.WriteLine("请输入直角三角形行数");
        int n = Convert.ToInt32(Console.ReadLine());
        for (int i=1;i<= n;i++)
        {
            for (int j=1;j<= n-i;j++)
            {
                Console.Write("*");
            }
            Console.WriteLine();
        }
        Console.ReadKey();

image.png

        Console.WriteLine("请输入等腰三角形行数");
        int n = Convert.ToInt32(Console.ReadLine());
        for (int i=1;i<= n;i++)
        {
            for (int j=1;j<= n-i;j++)
            {
                Console.Write(" ");
            }
            for (int j = 1; j <=2*i-1; j++)
            {
                Console.Write("*");
            }
            Console.WriteLine();
        }
        Console.ReadKey();

image.png

        for (int i = 1; i <= 9; i++)
        {
            for (int j = 1; j <= i; j++)
            {
                Console.Write("{0}*{1}={2}\t",j,i,j*i);
            }
            Console.WriteLine();
        }
        Console.ReadKey();

image.png