利用多态实现简单的计算器

#include <iostream>
using namespace std;

class AbstractCalculator
{
    
public:
	virtual int getChar()
	{
    
		return 0;
	}
	int m_A = 0;
	int m_B = 0;
};

class AddCalculator : public AbstractCalculator
{
    
public:
	int getChar()
	{
    
		return m_A + m_B;
	}
};

class SubCalculator : public AbstractCalculator
{
    
public:
	int getChar()
	{
    
		return m_A - m_B;
	}
};

class MulCalculator : public AbstractCalculator
{
    
public:
	int getChar()
	{
    
		return m_A * m_B;
	}
};

class DivCalculator : public AbstractCalculator
{
    
public:
	int getChar()
	{
    
		return m_A / m_B;
	}
};

void test01()
{
    
	AbstractCalculator* abc = new AddCalculator;
	abc->m_A = 10;
	abc->m_B = 20;
	cout << abc->m_A << "+" << abc->m_B << "=" << abc->getChar() << endl;
	delete abc;

	abc = new SubCalculator;
	abc->m_A = 10;
	abc->m_B = 20;
	cout << abc->m_A << "-" << abc->m_B << "=" << abc->getChar() << endl;
	delete abc;

	abc = new MulCalculator;
	abc->m_A = 10;
	abc->m_B = 20;
	cout << abc->m_A << "*" << abc->m_B << "=" << abc->getChar() << endl;
	delete abc;

	abc = new DivCalculator;
	abc->m_A = 10;
	abc->m_B = 20;
	cout << abc->m_A << "/" << abc->m_B << "=" << abc->getChar() << endl;
	delete abc;
}

int main()
{
    
	test01();
	return 0;
}