12.20练习二

Console.WriteLine("请输入直角三角形的行数：");

int a = Convert.ToInt32(Console.ReadLine());

for (int i = 1; i <= a; i++)

{

for (int j = a-i+1; j >0; j--)

{

Console.Write("*");

}

Console.WriteLine();

}

Console.ReadKey();