namespace _055循环练习和函数练习 {
class Program {
static int Factorial(int n)
{
int res = 1;
for (int i = 1; i <= n; i++)
{
res *= i;
}
return res;
}
static void Main(string[] args)
{
//float height = 100;
//float distance = 0;
//for (int i = 1; i <= 10; i++)
//{
// distance += height;
// height /= 2;
//}
//Console.WriteLine("经过了"+distance+"米,第10次反弹"+height/2+"米");
int sum = 0;
for (int i = 1; i <= 20; i++)
{
sum += Factorial(i);
}
Console.WriteLine(sum);
Console.ReadKey();
}
}
}
