Question

用C#输出一个等腰三角形

*
***
*****
*******
用3个for循环 行数 空格 *

Answer 1

Console.WriteLine("请输入等边三角形高度：");
string line = Console.ReadLine();
int height = 3;
if (false == int.TryParse(line, out height))
{
Console.WriteLine("输入高度不是合法整数，默认高度3执行");
}

for (int h = 0; h < height; h++)
{
for (int idx = 0; idx <= 2 * height - 1; idx++)
{
if (idx > height - h - 1 && idx <=height - h - 1 + 2 * h + 1)
{
Console.Write("*");
}
else
{
Console.Write(" ");
}
}

Console.WriteLine();
}

Console.Write("按任意键退出程序");
Console.ReadKey();