C++制作的简单工厂模式计算器

/*作者: @SnakeJoy **日期: 2012/08/30 **功能: 实现四则运算的CPP文件 */ #include "Operation.h" double Operation::GetResult(double numbA, double numbB) { m_numbA = numbA; m_numbB = numbB; double dResult = 0.0; //TODO计算 return dResult; } double OperationAdd::GetResult(double numbA, double numbB) { m_numbA = numbA; m_numbB = numbB; double dResult = 0.0; //TODO计算 dResult = m_numbA + m_numbB; return dResult; } double OperationSub::GetResult(double numbA, double numbB) { m_numbA = numbA; m_numbB = numbB; double dResult = 0.0; //TODO计算 dResult = m_numbA - m_numbB; return dResult; } double OperationMul::GetResult(double numbA, double numbB) { m_numbA = numbA; m_numbB = numbB; double dResult = 0.0; //TODO计算 dResult = m_numbA * m_numbB; return dResult; } double OperationDiv::GetResult(double numbA, double numbB) { m_numbA = numbA; m_numbB = numbB; if(numbB == 0.0) throw "except of deving zero!"; double dResult = 0.0; //TODO计算 dResult = m_numbA / m_numbB; return dResult; } Operation* OperationFactory::CreateOperation(char c) { Operation* oper; switch(c) { case '+': oper = new OperationAdd(); break; case '-': oper = new OperationSub(); break; case '*': oper = new OperationMul(); break; case '/': oper = new OperationDiv(); break; default: throw "The operator that you have inputted is illegal!"; break; } return oper; }