菱形

Console.Write("请输入一个数：");
int n = int.Parse(Console.ReadLine());
for (int i = 1; i <= n; i++)
{
for (int b = 1; b <= n - i; b++)
{
Console.Write(" ");
}
for (int j = 1; j <= 2 * i - 1; j++)
{
Console.Write("☆");
}
Console.Write(" ");
}
for (int p = 1; p <= n; p++)
{
for (int o = 1; o <= p; o++)
{
Console.Write(" ");
}
for (int k = 1; k <= 2 * (n - p) - 1; k++)
{
Console.Write("☆");
}
Console.Write(" ");
}

Console.ReadLine();