C# 程序样例

using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication2{ interface IMath { int Factorial(int f); double SquareRoot(double s); } class Compute : IMath { public int Factorial(int f) { int i; int result = 1; for (i = 2; i < f; i++) result = result * i; return result; } public double SquareRoot(double s) { return System.Math.Sqrt(s); } class Program { static void Main(string[] args) { Compute c = new Compute(); int v; v = 5; System.Console.WriteLine("{0}factorial:{1}", v, c.Factorial(v)); System.Console.WriteLine("Square root of {0}:{1:f4}", v, c.SquareRoot(v)); } } }}