//计算阶乘的方法
using System;
namespace ConsoleApplication1
{
class Program
{
static int fac(int n)
{
int i, f = 1;
for (i = 1; i <= n; i++) f = f * i; return f;
}
static void Main(string[] args)
{
int i;
for (i = 1; i <= 10; i++)
Console.WriteLine("{0}!={1}", i, fac(i));
} 
}
}