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using System; using System.Collections.Generic; using System.Text;   namespace Operation {     /// <summary>     /// 运算类     /// </summary>     public class Operation     {         private double _numberA = 0;         private double _numberB = 0;                  /// <summary>         /// 数字A         /// </summary>         public double NumberA         {             get             {                 return _numberA;             }             set             {                 _numberA = value;             }         }           /// <summary>         /// 数字B         /// </summary>         public double NumberB         {             get             {                 return _numberB;             }             set             {                 _numberB = value;             }         }           /// <summary>         /// 得到运算结果         /// </summary>         /// <returns></returns>         public virtual double getResult()         {             double result = 0;             return result;         }              }       /// <summary>     /// 加法类     /// </summary>     class OperationAdd : Operation     {         public override double getResult()         {             double result = 0;             result = NumberA + NumberB;             return result;         }     }       /// <summary>     /// 减法类     /// </summary>     class OperationSub : Operation     {        public override double getResult()         {             double result = 0;             result = NumberA - NumberB;             return result;         }     }       /// <summary>     /// 乘法类     /// </summary>     class OperationMul : Operation     {         public override double getResult()         {             double result = 0;             result = NumberA * NumberB;             return result;         }     }       /// <summary>     /// 除法类     /// </summary>     class OperationDiv : Operation     {         public override double getResult()         {             double result = 0;             if (NumberB==0)                 throw new Exception("除数不能为0。");             result = NumberA / NumberB;             return result;         }     }       /// <summary>     /// 平方类     /// </summary>     class OperationSqr : Operation     {         public override double getResult()         {             double result = 0;             result = NumberB * NumberB;             return result;         }     }       /// <summary>     /// 平方根类     /// </summary>     class OperationSqrt : Operation     {         public override double getResult()         {             double result = 0;             if (NumberB < 0)                 throw new Exception("负数不能开平方根。");             result = Math.Sqrt(NumberB);             return result;         }     }       /// <summary>     /// 相反数类     /// </summary>     class OperationReverse : Operation     {         public override double getResult()         {             double result = 0;             result = -NumberB;             return result;         }     }       /// <summary>     /// 运算类工厂     /// </summary>     class OperationFactory     {         public static Operation createOperate(string operate)         {             Operation oper = null;             switch (operate)             {                 case "+":                     {                         oper = new OperationAdd();                         break;                     }                 case "-":                     {                         oper = new OperationSub();                         break;                     }                 case "*":                     {                         oper = new OperationMul();                         break;                     }                 case "/":                     {                         oper = new OperationDiv();                         break;                     }                 case "sqr":                     {                         oper = new OperationSqr();                         break;                     }                 case "sqrt":                     {                         oper = new OperationSqrt();                         break;                     }                 case "+/-":                     {                         oper = new OperationReverse();                         break;                     }             }               return oper;         }     }   }

 

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