课程作业七

#include<iostream>
#include<stdlib.h>
using namespace std;

class Random{
    public:
        virtual void random(int quantity);
};

class RandomNumber:public Random
{
    int number;
    public:
        void random(int quantity){
            number=rand()%11;
        }
};

class RandomOperation:public Random
{
    char operation;
    public:
        void random(int quantity){
            int a=rand()%4;
            switch(a){
                case 0:operation=‘+‘;break;
                case 1:operation=‘-‘;break;
                case 2:operation=‘*‘;break;
                case 3:operation=‘/‘;
            }
        }
};

class SimpleFactory
{
    public:
        static Random *creat_random(string &choose)
        {
            if("num"==choose)
            {
                return new RandomNumber();
            }
            if("ope"==choose)
            {
                return new RandomOperation();
            }
        }
};