用面向对象方法设计一个计算器控制台程序。
1.1设计一个父类Operation, 数据成员包含两个操作数m_numberA，m_numberB。 成员函数包括set(),get()函数设置操作数的值，虚函数GetResult()用于输出结果。
1.2分别设计派生类 OperationAdd，OperationSub，OperationMul， OperationDiv实现加减乘除操作,注意除法操作除数不能为0。
1.3派生类统一继承自父类Operation, 重写虚函数GetResult()输出操作后的结果。
1.4 OperationFactory类已经写好，可以直接使用。
class OperationFactory {
public:
static Operation * CreateOperate(char oper)
{
Operation * poper = NULL;
switch (oper)
{
case '+':
poper = new OperationAdd;
break;
case '-':
poper = new OperationSub;
break;
case '*':
poper = new OperationMul;
break;
case '/':
poper = new OperationDiv;
break;
}
return poper;
}
};
int main()
{
int flag = 1;
while (flag)
{
cout << "input A:";
double numA;
cin >> numA;
cout << "input operator:";
char oper;
cin >> oper;
cout << "input B:";
double numB;
cin >> numB;
Operation* poper = OperationFactory::CreateOperate(oper);
poper->SetNumA(numA);
poper->SetNumB(numB);
cout << poper->GetNumA() << ' ' << oper << ' ' << poper->GetNumB() << " = " << poper->GetResult() << endl;
cout << "是否需要继续: (0/1)";
cin >> flag;
}
return 0;
}
class Operation
{
double m_numberA,m_numberB;
public:
double GetNumA() {return m_numberA;}
double GetNumB() {return m_numberB;}
void SetNumA(double A) {m_numberA = A;}
void SetNumB(double B) {m_numberB = B;}
virtual double GetResult() {return 0;}
};
class OperationAdd : public Operation
{
public:
virtual double GetResult() {return GetNumA() + GetNumB();}
};
class OperationSub : public Operation
{
public:
virtual double GetResult() {return GetNumA() - GetNumB();}
};
class OperationMul : public Operation
{
public:
virtual double GetResult() {return GetNumA() * GetNumB();}
};
class OperationDiv : public Operation
{
public:
virtual double GetResult() { if(GetNumB() == 0) return 0; return GetNumA() / GetNumB();}
};
class OperationFactory {
public:
static Operation * CreateOperate(char oper)
{
Operation * poper = NULL;
switch (oper)
{
case '+':
poper = new OperationAdd;
break;
case '-':
poper = new OperationSub;
break;
case '*':
poper = new OperationMul;
break;
case '/':
poper = new OperationDiv;
break;
}
return poper;
}
};
int main()
{
int flag = 1;
while (flag)
{
cout << "input A:";
double numA;
cin >> numA;
cout << "input operator:";
char oper;
cin >> oper;
cout << "input B:";
double numB;
cin >> numB;
Operation* poper = OperationFactory::CreateOperate(oper);
poper->SetNumA(numA);
poper->SetNumB(numB);
cout << poper->GetNumA() << ' ' << oper << ' ' << poper->GetNumB() << " = " << poper->GetResult() << endl;
cout << "是否需要继续: (0/1)";
cin >> flag;
}
return 0;
}