#include<iostream> #include<cstring> using namespace std; class PersonFactory { int id; char name[50]; int age; public: PersonFactory(int i = 0, char * nm = 0, int a = 15);//i:id;nm:name;a:age virtual ~PersonFactory() {}; virtual void PrintInfo() { cout << id << endl; cout << name << endl; cout << age << endl; }; PersonFactory * CreateStudent(int id, char *name, int age, int grade); PersonFactory * CreateTeacher(int id, char *name, int age, char *department); }; int main() { PersonFactory vn; PersonFactory *ps,*pt; int id,age,grade; char name[50],department[50]; cin>>id>>name>>age>>department; ps=vn.CreateTeacher (id,name,age,department); ps->PrintInfo (); cin>>id>>name>>age>>grade; ps=vn.CreateStudent (id,name,age,grade); ps->PrintInfo (); return 0; }请依据这段代码，将其补全完成上个问题将上个问题

以下是补全后的代码：

#include<iostream> 
#include<cstring> 

using namespace std; 

class PersonFactory  
{    
    int id;    
    char name[50];    
    int age;    
public:    
    PersonFactory(int i = 0, char * nm = 0, int a = 15)
    {        
        id = i;        
        strcpy(name, nm);        
        age = a;    
    }    
    virtual ~PersonFactory() {};    
    virtual void PrintInfo()    
    {        
        cout << id << endl;        
        cout << name << endl;        
        cout << age << endl;    
    };    
    class Student : public PersonFactory 
    {        
        int grade;        
    public:        
        Student(int i, char *nm, int a, int g) : PersonFactory(i, nm, a)        
        {            
            grade = g;        
        }        
        void PrintInfo()        
        {            
            PersonFactory::PrintInfo();            
            cout << grade << endl;        
        }    
    };    
    class Teacher : public PersonFactory 
    {        
        char department[50];        
    public:        
        Teacher(int i, char *nm, int a, char *dp) : PersonFactory(i, nm, a)        
        {            
            strcpy(department, dp);        
        }        
        void PrintInfo()        
        {            
            PersonFactory::PrintInfo();            
            cout << department << endl;        
        }    
    };    
    PersonFactory * CreateStudent(int id, char *name, int age, int grade)    
    {        
        return new Student(id, name, age, grade);    
    }    
    PersonFactory * CreateTeacher(int id, char *name, int age, char *department)    
    {        
        return new Teacher(id, name, age, department);    
    }  
}; 

int main()  
{    
    PersonFactory vn;    
    PersonFactory *ps,*pt;    
    int id,age,grade;    
    char name[50],department[50];    
    cin>>id>>name>>age>>department;    
    pt=vn.CreateTeacher (id,name,age,department);    
    pt->PrintInfo ();    
    cin>>id>>name>>age>>grade;    
    ps=vn.CreateStudent (id,name,age,grade);    
    ps->PrintInfo ();    
    return 0;  
}

这个程序使用了工厂模式，其中 PersonFactory 类是一个抽象基类，包含了一个虚函数 PrintInfo()，用于打印人员的信息。它有两个派生类，分别是 Student 和 Teacher，分别表示学生和教师。在 PersonFactory 类中，定义了两个工厂方法 CreateStudent() 和 CreateTeacher()，用于创建学生和教师对象。在 main() 函数中，首先调用 CreateTeacher() 方法创建一个教师对象，然后调用 PrintInfo() 方法打印出教师的信息；接着调用 CreateStudent() 方法创建一个学生对象，然后调用 PrintInfo() 方法打印出学生的信息。