四则运算-C#实现

  static void Main(string[] args)
        {   int num;//The number of expressions
            int cnt = 0;
            int token = 0;
            var arguments = CommandLineArgumentParser.Parse(args);//command line parameter
            int anslen = 1;//The number of the answers of expressions that have been used.
            double[] ansrep;//array to maintain answers that have been used
            ansrep = new double[1000];
            ansrep[0] = -23579;
            if (!arguments.Has("-c"))//如果命令行参数没有-c
                num = 20;
            else
            { 
            num = int.Parse(arguments.Get("-c").Next);//命令行参数中得到要输出的表达式数量
                token = 1;
            }
            if (token==0)
            {
                for (int i = 0; i < num; i++)
                {
                    Test t = new Test();//new Test
                    t.opinit();
                    t.GetBracketExp();
                    // t.GetExp();
                    //t.NoRepeatedAns(anslen, ansrep);
                    ansrep[(anslen++) - 1] = t.ansr;
                    t.DispExp();//display expression
                    Console.Write("?");
                    double ans = double.Parse(Console.ReadLine());
                    // Console.WriteLine("{0},{1}",ans,t.ansr);
                    if (Math.Abs(ans - t.ansr) < 1e-7)//answer is right
                    {
                        Console.WriteLine("You are very clever!!!");
                        cnt++;
                    }
                    else//answer is wrong
                    {
                        if (Math.Abs((double)Math.Round(t.ansr) - t.ansr) < 1e-7)//Intenger
                        {
                            Console.WriteLine("Sorry,the answer is {0}", (int)t.ansr);
                        }
                        else//decimal
                        {
                            string floatValue = t.ansr.ToString();
                            floatValue = floatValue.TrimEnd(‘.‘, ‘0‘);
                            Console.WriteLine("Sorry,the answer is {0}", floatValue);

                        }
                    }
                    /* for (int j = 0; j < anslen; j++)
                     {
                         Console.WriteLine("{0:f5}", ansrep[j]);
                     }*/
                }
            }
            else
            {
                for (int i = 0; i < num; i++)
                {
                    Test t = new Test();//new Test
                    t.opinit();
                    t.GetBracketExp();
                    // t.GetExp();
                    //t.NoRepeatedAns(anslen, ansrep);
                    ansrep[(anslen++) - 1] = t.ansr;
                    t.DispExpAns(t);//display expression and answer
           
                }
            }
            Console.WriteLine("Total 20 Problems,you have solved {0}problem(s)", cnt);
        }
    }