编译器：vs2022

main.cpp

#include <iostream>
#include <iomanip>
#include "person.h"const int Sum = 2;class Group
{
protected:PostGra st[Sum];int sum;
public:Group();void Input();void SortByID();void Output();
};Group::Group()
{sum = Sum;
}void Group::Input()
{int i;for (i = 0; i < sum; i++)st[i].Input();
}void Group::SortByID()
{int index, i, k;PostGra temp;for (k = 0; k < sum - 1; k++){index = k;for (i = k + 1; i < sum; i++)if (st[i].GetID() < st[index].GetID())index = i;if (index != k){temp = st[index];st[index] = st[k];st[k] = temp;}}
}void Group::Output()
{int i;std::cout << std::endl << "The group information:" << std::endl;std::cout << "ID" << std::setw(10) << "Name" << std::setw(10) << "Age" << std::setw(10) << "Gender" <<std::setw(10) << "Spec" << std::setw(10) << "research"<< std::endl;for (i = 0; i < sum; i++){std::cout << st[i].GetID() << std::setw(10) << st[i].GetName()<< std::setw(10) << st[i].GetGender() << std::setw(10) << st[i].GetSpeciality()<< std::setw(10) << st[i].GetResearchTopic() << std::setw(10) << st[i].GetAcademicTitle() << std::endl;}
}int main()
{Group group;group.Input();group.SortByID();group.Output();return 0;
}

person.h

#pragma once
#ifndef _PERSON
#define _PERSON
#include <string>class Person
{
protected:std::string ID;std::string name;std::string gender;
public:Person(std::string = "000", std::string = "unknown", std::string = "unknown");void Input();std::string GetID();std::string GetName();std::string GetGender();
};class Student : virtual public Person
{
protected:std::string speciality;
public:Student(std::string, std::string, std::string = "000", std::string = "unknown");void Input();std::string GetSpeciality();
};class Graduate :virtual public Student
{
protected:std::string researchTopic;
public:Graduate(std::string=" ", std::string=" ", std::string=" ", std::string = "000", std::string = "unknown");void Input();std::string GetResearchTopic();
};class Teacher :virtual public Person
{
protected:std::string academicTitle;
public:Teacher(std::string, std::string, std::string, std::string = "unknown");void Input();std::string GetAcademicTitle();
};class PostGra :public Graduate, public Teacher
{
public:PostGra(std::string=" ", std::string=" ", std::string=" ", std::string=" ", std::string = "000", std::string = "unknown");void Input();
};
#endif

person.cpp

#include "person.h"
#include <iostream>Person::Person(std::string id, std::string name, std::string gender)
{ID = id;name = name;gender = gender;
}void Person::Input()
{std::cout << "Enter ID: ";std::cin >> ID;std::cout << "Enter name: ";std::cin >> name;std::cout << "Enter gender: ";std::cin >> gender;
}std::string Person::GetID()
{return ID;
}std::string Person::GetName()
{return name;
}std::string Person::GetGender()
{return gender;
}Student::Student(std::string id, std::string name, std::string gender, std::string speciality) : Person(id, name, gender)
{speciality = speciality;
}void Student::Input()
{Person::Input();std::cout << "Enter speciality: ";std::cin >> speciality;
}std::string Student::GetSpeciality()
{return speciality;
}Graduate::Graduate(std::string id, std::string name, std::string gender, std::string speciality, std::string rese) :Person(id, name, gender), Student(id, name, gender, speciality)
{researchTopic = rese;
}void Graduate::Input()
{Student::Input();std::cout << "Enter research topic: ";std::cin >> researchTopic;
}std::string Graduate::GetResearchTopic()
{return researchTopic;
}Teacher::Teacher(std::string id, std::string name, std::string gender, std::string title) : Person(id, name, gender)
{academicTitle = title;
}void Teacher::Input()
{Person::Input();std::cout << "Enter academic title: ";std::cin >> academicTitle;
}std::string Teacher::GetAcademicTitle()
{return academicTitle;
}PostGra::PostGra(std::string id, std::string name, std::string gender, std::string speciality, std::string rese, std::string title) : Person(id, name, gender), Student(id, name, gender, speciality), Teacher(id, name, gender, title)
{;
}void PostGra::Input()
{Graduate::Input();std::cout << "Enter academic title: ";std::cin >> academicTitle;
}