c++多态 计算器类

#include
#include
using namespace std;
//多态 计算器类
class caculator {
public:
	int num1;
	int num2;
	int getresult(string a) {
		if(a=="+")
		return num1 + num2;
		if (a == "-")
		return num1-num2;
		if (a == "*")
		return num1*num2;
	}

};
void test1() {
	caculator b;
	b.num1 = 10;
	b.num2 = 10;
	cout<< b.num1<<"+"<< b.num2 <<"="<m_num1 = 10;
	c->m_num2 = 10;
	cout << c->m_num1 << "+" << c->m_num2 << "=" << c->getresult() << endl;
	//用完记得清楚
	delete c;
	 c = new sub;//指针c重新赋值
	c->m_num1 = 10;
	c->m_num2 = 10;
	cout << c->m_num1 << "-" << c->m_num2 << "=" << c->getresult() << endl;
	delete c;
	 c = new mul;
	c->m_num1 = 10;
	c->m_num2 = 10;
	cout << c->m_num1 << "*" << c->m_num2 << "=" << c->getresult() << endl;
	delete c;
}
int main() {
	test1();
	test2();
	system("pause");
	return 0;
}
//组织结构清晰
//可读性强
//对于前期和后期维护性高