2018-12-20打印直角三角形 1. 需求说明 (1) .

try
{
int num = Convert.ToInt32(Console.ReadLine());
for (int i = 0; i <= num; i++)
{
for (int j = 0; j < 2i-1; j++)
{
Console.Write("");
}
Console.WriteLine(" ");
}

        }
        catch
        {
           
        }
        Console.ReadKey();