#include <iostream> using namespace std; class Person { public: Person(string a) { sex = a; } void showPerson() { cout<<sex<<endl; } private: string sex; }; class Employee:virtual 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 a4,string b2,string c2,string d):Employee(a4,b2),Student(a4,c2) { name=d; grade=c2; location=b2; } void showPartTime_Graduate_student() { showPerson(); cout<<name; } private: string location; string grade; string name; }; int main() { PartTime_Graduate_student i("1","2","3","4"); i.showPartTime_Graduate_student; return 0; }

代码中存在一些问题，我帮您进行修正：

1. 在 PartTime_Graduate_student 类的定义中，location 和 grade 已经在 Employee 和 Student 类中定义过了，不需要再次定义。

2. 在 PartTime_Graduate_student 的构造函数中，应该将 location 和 grade 传递给对应的父类构造函数，否则会导致这些成员变量没有被正确初始化。

3. 在 showPartTime_Graduate_student 函数中，应该在调用 showPerson 函数时加上括号，否则会导致编译错误。

修改后的代码如下：

#include <iostream>
using namespace std;

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

class Employee : virtual 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 a4, string b2, string c2, string d) : Employee(b2, a4), Student(c2, a4) {
        name = d;
    }
    void showPartTime_Graduate_student() {
        showPerson();
        cout << name << endl;
    }
private:
    string name;
};

int main() {
    PartTime_Graduate_student i("1", "2", "3", "4");
    i.showPartTime_Graduate_student();
    return 0;
}