C〓〓プログラミングは階乗アルゴリズムを実現します.
方法1:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Test_02_3
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine(" :");
int m = int.Parse(Console.ReadLine());
int sum = 0;
for (int i = 1; i <= m; i++)
{
sum = sum + fun(i);
}
for (int i = 1; i < m; i++)
Console.Write("{0}!+", i);
Console.WriteLine("{0} = {1} ", m, sum);
Console.ReadLine();
}
public static int fun(int n)
{
int a, j;
for (a = 1, j = 1; j <= n; j++)
a = a * j;
return a;
}
}
}
出力結果 , :
10
0!+1!+2!+3!+4!+5!+6!+7!+8!+9!+10! = 4037913
方法二:(再帰)using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Test_02_2
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine(" , :");
int m = int.Parse(Console.ReadLine());
//Program pro = new Program();
//Console.WriteLine("{0}", fun(m));
//Console.ReadLine();
int sum = 0;
for (int i = 0; i <= m; i++)
{
sum = sum + fun(i);
}
for (int i = 0; i < m; i++)
{
Console.Write("{0}!+", i);
}
Console.WriteLine("{0}! = {1}", m, sum);
Console.ReadLine();
}
public static int fun(int n)
{
if (n < 1)
return 0;
if (n == 1)
return 1;
return n * fun(n - 1);
}
}
}
出力結果: , :
10
0!+1!+2!+3!+4!+5!+6!+7!+8!+9!+10! = 4037913