编写一个程序，对输入的四个数取最大值和最小值

<span style="font-size:24px;">int a = int.Parse(Console.ReadLine());
int b = int.Parse(Console.ReadLine());
int c = int.Parse(Console.ReadLine());
int d = int.Parse(Console.ReadLine());
int max, min;
if (a < b)
{
max = a;
}
else
{
max = b;
}
if (max < c)
{
max = c;
}
if (max < d)
{
max = d;
}
if (a < b)
{
min = a;
}else{
min = b;
}
if (min > c) {
min = c;
}
if (min > d) {
min = d;
}
Console.WriteLine("最小值是"+min);

Console.WriteLine("最大值是{0}",max);</span>