//Main:

复制代码 代码如下:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Factorial

{

class Program

{

static void Main(string[] args)

{

Function obj = new Function();

Console.WriteLine("Would you like to know which number of Factorial：");

int number = Convert.ToInt32(Console.ReadLine());

Console.WriteLine();

Console.Write("The Fibonacci of {0} is：{1}", number, obj.Factorial(number));

Console.WriteLine();

Console.Write("The FactorialRecursion of {0} is：{1}", number, obj.FactorialRecursion(number));

Console.ReadKey();

}

}

}

//Class:

复制代码 代码如下:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Factorial

{

class Function

{

/// <summary>

/// Factorial定义为：

/// ┌ 1 n=0

/// N!=│

/// └ n(n-1)! n>0

/// </summary>

/// <param name="number"></param>

/// <returns></returns>

public int Factorial(int number)

{

if (number != 0)

{

return number * Factorial(number - 1);

}

else if (number == 0)

{

return 1;

}

return number;

}

public int FactorialRecursion(int number)

{

int F = 1;

for (int i = 1; i <= number; i++)

{

F *= i;

}

return F;

}

}

}

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