C#编程-95：分部类partial的使用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace PartialTest
{
    partial class Arithmetic
    {
        public int Factorial(int num)
        {
            int factorial = 1;
            for (int i = num; i > 0; i--)
            {
                factorial *= i;
            }
            return factorial;
        }
    }
    partial class Arithmetic
    {
        public int Square(int num)
        {
            return num * num;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Arithmetic a = new Arithmetic();
            int num = 5;
            Console.WriteLine("求 {0} 的阶乘：",num);
            Console.WriteLine(a.Factorial(num));
            Console.WriteLine("求 {0} 的平方：", num);
            Console.WriteLine(a.Square(num));
            Console.ReadKey();
        }
    }
}