단순한 공장 모델

  
  
  
  

   
   
   
   
#include<iostream> 
   
   
   
   
using namespace std;  
   
   
   
   
class Operation  
   
   
   
   
{  
   
   
   
   
public :  
   
   
   
   
      
   
   
   
   
    Operation(double A,double B):_numberA(A),_numberB(B){}  
   
   
   
   
    double Get_numA(){return _numberA;}  
   
   
   
   
    double Get_numB(){return _numberB;}  
   
   
   
   
    virtual double Get_Result(){double result=0; return result;}  
   
   
   
   
private:  
   
   
   
   
    double _numberA,_numberB;  
   
   
   
   
 
   
   
   
   
};  
   
   
   
   
class Operation_Add:public Operation  
   
   
   
   
{  
   
   
   
   
public:  
   
   
   
   
    Operation_Add(double A,double B):Operation(A,B){}  
   
   
   
   
    double Get_Result()  
   
   
   
   
    {  
   
   
   
   
      
   
   
   
   
        return Get_numA()+Get_numB();  
   
   
   
   
    }  
   
   
   
   
};  
   
   
   
   
class Operation_Sub:public Operation  
   
   
   
   
{  
   
   
   
   
public:  
   
   
   
   
    Operation_Sub(double _numberA,double _numberB):Operation(_numberA,_numberB){}  
   
   
   
   
    double Get_Result()  
   
   
   
   
    {  
   
   
   
   
        return Get_numA()-Get_numB();  
   
   
   
   
    }  
   
   
   
   
 
   
   
   
   
};  
   
   
   
   
class Operation_Mul:public Operation  
   
   
   
   
{  
   
   
   
   
    public:  
   
   
   
   
    Operation_Mul(double _numberA,double _numberB):Operation(_numberA,_numberB){}  
   
   
   
   
    double Get_Result()  
   
   
   
   
    {  
   
   
   
   
        return Get_numA()*Get_numB();  
   
   
   
   
    }  
   
   
   
   
 
   
   
   
   
};  
   
   
   
   
class OperationFactory  
   
   
   
   
{  
   
   
   
   
public:  
   
   
   
   
    OperationFactory(double _numA,double _numB,char operate)  
   
   
   
   
    {  
   
   
   
   
        Operation *opr;  
   
   
   
   
        switch (operate)  
   
   
   
   
        {  
   
   
   
   
        case'+':  
   
   
   
   
          opr=new Operation_Add(_numA,_numB);    break;  
   
   
   
   
        case'-':  
   
   
   
   
            opr=new Operation_Sub(_numA,_numB);  break;  
   
   
   
   
        case'*':  
   
   
   
   
            opr=new Operation_Mul(_numA,_numB);break;  
   
   
   
   
        default:  
   
   
   
   
            break;  
   
   
   
   
        }  
   
   
   
   
        cout<<opr->Get_Result();  
   
   
   
   
 
   
   
   
   
    }  
   
   
   
   
} ;  
   
   
   
   
int main()  
   
   
   
   
{  
   
   
   
   
    double a,b; char ch;  
   
   
   
   
    cin>>a>>b>>ch;  
   
   
   
   
      
   
   
   
   
    OperationFactory opar(a,b,ch);  
   
   
   
   
 
   
   
   
   
    return 0;  
   
   
   
   
} 
  
  
  
  

바늘만 new,, 서브클래스 구조 함수에 매개 변수를 부류 구조 함수에 전달하는 방법