c++多态的一个示范

多态的好处：

1.组织结构清晰

2.可读性强

3.对于前期和后期的维护性高

实现一个计算器的多态

#include<bits/stdc++.h>
using namespace std;
class abstractcaculator
{
    public:
        virtual int getresult()
        {
            return 0;
        }
        int a;
        int b;
};
class add:public abstractcaculator
{
    public:
        int getresult()
        {
            return a + b;
        }
};
class sub:public abstractcaculator
{
    public:
        int getresult()
        {
            return a - b;
        }
};
class mul:public abstractcaculator
{
    public:
        int getresult()
        {
            return a * b;
        }
};

void test()
{
    abstractcaculator *abc = new add;
    abc->a = 10;
    abc->b = 10;
    cout << abc->a <<" + " << abc->b << " = " << abc->getresult() << endl;
    delete abc;
    
    abc = new sub;
    abc->a = 10;
    abc->b = 10;
    cout << abc->a <<" - " << abc->b << " = " << abc->getresult() << endl;
    delete abc;
    
    abc = new mul;
    abc->a = 10;
    abc->b = 10;
    cout << abc->a <<" * " << abc->b << " = " << abc->getresult() << endl;
    delete abc;
}

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