标准体重计算

Console.WriteLine("请输入性别");       

          string xb = Console.ReadLine();        

         Console.WriteLine("请输入身高");         

        double sg = double.Parse(Console.ReadLine());         

        Console.WriteLine("请输入体重");        

         double tz = double.Parse(Console.ReadLine());        

         if (xb == "男")       

          {      

               double n = tz - sg + 100;          

               if (n >= -3 && n <= 3)           

          {             

            Console.WriteLine("你的体重是标准体重");        

             }             

        else if (n > 3)          

           {           

              Console.WriteLine("你该减肥了");

             }          

           else           

          {        

           Console.WriteLine("你该吃肉了");            

           }           

         }             

               else  if (xb == "女")         

        {            

         double n = tz - sg + 110;           

          if (n >= -3 && n <= 3)           

          {              

           Console.WriteLine("继续保持");        

             }            

         else if (n > 3)            

         {            

             Console.WriteLine("你该运动了");      

               }              

       else          

           {                

         Console.WriteLine("你该增肥了");        

             }          

       }           

      else        

         {            

         Console.WriteLine("输入错误");

          }