C#使用for循环来计算阶乘

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace factorial {
   class Test {
      static void Main(string[] args) {
         int i, res;
         int value = 5;
         res = value;
         for (i = value - 1; i >= 1; i--) {
            res = res * i;
         }
         Console.WriteLine("nFactorial of "+value+" = "+res);
         Console.ReadLine();
      }
   }
}

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