C#练习记录

using System;
 
namespace JieCheng{
    class JC{
        public int cal(int num){
            int ans=num==1?num:num*cal(num-1);
            return ans;
        }
    }
    
    class JCMain{
        static void Main(string[] args){
            JC jc = new JC();
            int result=jc.cal(3);
            Console.WriteLine("{0}",result);
            Console.ReadKey();
        }
        
    }
    
}