#include <iostream> using namespace std; class Person { public: Person(string a) { sex = a; } void showPerson() { cout<<sex<<endl; } private: string sex; }; class Employee: public Person { public: Employee(string b,string a2) : Person(a2) { location=b; } void showEmployee() { showPerson(); cout<<location<<endl; } private: string location; }; class Student:virtual public Person { public: Student( string c ,string a3) : Person(a3) { grade=c; } void showStudent() { showPerson(); cout<<grade<<endl; } private: string grade; }; class PartTime_Graduate_student: public Employee,public Student { public: PartTime_Graduate_student(); PartTime_Graduate_student(string a,string b2,string c2,string d):Employee(b2,a),Student(c2,a) { name=d; } void showPartTime_Graduate_student() { showPerson(); cout<<name<<endl; } private: string name; }; int main() { Employee a("1","2"); a.showEmployee(); Student b("3","4"); b.showStudent(); PartTime_Graduate_student i("1","2","3","4") i.PartTime_Graduate_student(;) return 0; }

这段代码存在一些问题，需要进行修改。

首先，在类 PartTime_Graduate_student 中，构造函数声明时多了一个分号，应该删除。

其次，在类 PartTime_Graduate_student 中，由于它同时继承了 Employee 和 Student 两个类，所以需要在构造函数中使用基类的构造函数来初始化成员变量。应该修改为：

PartTime_Graduate_student(string a,string b2,string c2,string d):Employee(b2,a),Student(c2,a),Person(a)
{
    name=d;
}

这里需要注意的是，由于 Student 类和 PartTime_Graduate_student 类都继承了 Person 类，所以在 PartTime_Graduate_student 的构造函数中，需要调用 Person 的构造函数来初始化 sex 成员变量。

最后，在 main 函数中，创建 PartTime_Graduate_student 对象时需要传入正确的参数。应该修改为：

PartTime_Graduate_student i("1","2","3","4");
i.showPartTime_Graduate_student();

完整代码如下：

#include <iostream>
using namespace std;

class Person
{
public:
    Person(string a)
    {
        sex = a;
    }
    void showPerson()
    {
        cout<<sex<<endl;
    }
private:
    string sex;
};

class Employee: public Person
{
public:
    Employee(string b,string a2)  : Person(a2)
    {
        location=b;
    }
    void showEmployee()
    {
        showPerson();
        cout<<location<<endl;
    }
private:
    string location;
};

class Student:virtual public Person
{
public:
    Student( string c ,string a3) : Person(a3)
    {
        grade=c;
    }
    void showStudent()
    {
        showPerson();
        cout<<grade<<endl;
    }
private:
    string grade;
};

class PartTime_Graduate_student: public Employee,public Student
{
public:
    PartTime_Graduate_student(string a,string b2,string c2,string d):Employee(b2,a),Student(c2,a),Person(a)
    {
        name=d;
    }
    void showPartTime_Graduate_student()
    {
        showPerson();
        cout<<name<<endl;
    }
private:
    string name;
};

int main()
{
    Employee a("1","2");
    a.showEmployee();

    Student b("3","4");
    b.showStudent();

    PartTime_Graduate_student i("1","2","3","4");
    i.showPartTime_Graduate_student();

    return 0;
}