包含基类/派生类对象的C++数组
包含基类/派生类对象的C++数组
提问于 2014-05-30 18:12:15
我正试着在这里安排一个任务，却被困在了一个点上。问题是用学生派生类创建Person类。然后重载<<和>>运算符。最后，创建检查程序，创建由20个人组成的数组，并继续加载任何人或学生。在任何时候，我们都可以打印我们所拥有的--到目前为止，人的输出是Name char*/Age int/Parents *char[2]，，学生输出是Name char*/Age int/ID int.
我的问题是数组点-我不知道如何实现它，现在我被困在：
- 指向person的指针数组
- 我们选择它的人/学生
- 获取数据的istream
以下是主要代码部分：
#include <iostream>
#include <conio.h>
#include "Header.h"
using namespace std;
int main()
{
char choice;
Person* Tablica[20];
Person* temp;
int i = 0;
while (1)
{
cout << "choices:" << endl;
cout << "(p)erson, (s)tudent, s(h)ow, (e)nd" << endl;
choice = _getch();
if (choice == 'h' || choice == 'H'){
for (int n = 0; n < i; n++){
cout << *Tablica[n] << endl;
}
}
if (choice == 'e' || choice == 'E'){ break; }
if (choice == 'p' || choice == 'P'){
temp = new Person;
cin >> *temp;
Tablica[i] = temp;
cout << *Tablica[i] << endl;
i++;
}
if (choice == 'S' || choice == 's'){
temp = new Student;
cin >> *temp;
Tablica[i] = temp;
cout << *Tablica[i] << endl;
i++;
}
}
system("PAUSE");
return 0;
}我能够加载第一个人/学生，然后没有错误的代码中断。所以我在这里问的是，你能不能看一下代码，也许能指出正确的方向？
免责声明:我们必须使用数组，没有向量等。是的，conio.h也在那里，它必须保持……显然我是初学者。
人：
#include <iostream>
class Person
{
public:
Person();
Person(const Person&);
Person(char* n, int a, char* Parent1, char* Parent2);
char* getName();
int getAge();
char* getDad();
char* getMum();
virtual ~Person();
virtual Person operator=(const Person &);
virtual Person operator+(const Person &);
virtual Person operator+=(Person &);
virtual void write(std::ostream&);
virtual void read(std::istream&);
friend std::istream& operator>>(std::istream&, Person &);
friend std::ostream& operator<<(std::ostream&, Person &);
protected:
char* name;
int age;
char* ParentName[2];
};
class Student : public Person
{
public:
Student();
Student(const Student&);
Student(char* name, int age, int id);
virtual ~Student();
int ident();
Student operator=(const Student &);
Student operator+(const Student &);
Student operator+=(Student &);
virtual void write(std::ostream&);
virtual void read(std::istream&);
friend std::istream& operator>>(std::istream&, Student &);
friend std::ostream& operator<<(std::ostream&, Student &);
private:
int ID;
};班级
#include "Header.h"
Person::Person(){
name = 0;
age = 0;
ParentName[0] = 0;
ParentName[1] = 0;
}
Person::Person(const Person & other)
{
name = other.name;
age = other.age;
ParentName[0] = other.ParentName[0];
ParentName[1] = other.ParentName[1];
}
Person::Person(char* n, int a, char* Parent1, char* Parent2){
name = n;
age = a;
ParentName[0] = Parent1;
ParentName[1] = Parent2;
}
Person::~Person(){}
char* Person::getName(){ return name; }
int Person::getAge(){ return age; }
char* Person::getDad(){ return ParentName[0]; }
char* Person::getMum(){ return ParentName[1]; }
Person Person::operator=(const Person & other){
name = other.name;
age = other.age;
ParentName[0] = other.ParentName[0];
ParentName[1] = other.ParentName[1];
return *this;
}
Person Person::operator+=(Person & other){
int i;
i = strlen(name) + strlen(other.name) + 4;
char * temp = new char[i];
strcpy_s(temp, i, name);
strcat_s(temp, i, " - ");
strcat_s(temp, i, other.name);
name = temp;
Person wynik(name, age, ParentName[0], ParentName[1]);
return wynik;
}
Person Person::operator+(const Person & other){
int i;
i = strlen(name) + strlen(other.name) + 4;
char * temp = new char[i];
strcpy_s(temp, i, name);
strcat_s(temp, i, " - ");
strcat_s(temp, i, other.name);
Person wynik(temp, age, ParentName[0], ParentName[1]);
return *this;
}
void Person::write(std::ostream& os)
{
os << "Osoba: name = " << this->getName() << ", wiek = " << this->getAge() << ", rodzice: " << this->getDad() << ", " << this->getMum();
}
std::ostream& operator<<(std::ostream& os, Person & other){
other.write(os);
return os;
}
void Person::read(std::istream& is)
{
char* name;
name = new char;
std::cout << "name: " << std::endl;
is >> name;
std::cout << "age: " << std::endl;
int age;
is >> age;
std::cout << "dad: " << std::endl;
char* dad;
dad = new char;
is >> dad;
std::cout << "mum: " << std::endl;
char* mum;
mum = new char;
is >> mum;
Person p(name, age, dad, mum);
*this = p;
}
std::istream & operator>>(std::istream & is, Person & os){
os.read(is);
return is;
}
Student::Student() : Person(){}
Student::Student(const Student& student) : Person(student){
ID = student.ID;
}
Student::Student(char* name, int age, int id) : Person(name, age, 0, 0){
ID = id;
}
Student::~Student(){}
Student Student::operator=(const Student & student){
Person::operator=(static_cast<Person const&>(student));
ID = student.ID;
return *this;
}
Student Student::operator+=(Student & student){
Student wynik(*this);
wynik.Person::operator=(wynik.Person::operator+=(student));
return wynik;
}
Student Student::operator+(const Student& student)
{
Person::operator+(static_cast<Person const&>(student));
return *this;
}
void Student::write(std::ostream& os)
{
os << "Student: name = " << this->getName() << ", age = " << this->getAge() << ", legitymacja: " << this->ident() << std::endl;
}
int Student::ident(){ return ID; }
std::ostream& operator<<(std::ostream& os, Student & other){
other.write(os);
return os;
}
void Student::read(std::istream& is)
{
char* name;
name = new char[20];
std::cout << "name: " << std::endl;
is >> name;
std::cout << "age: " << std::endl;
int age;
is >> age;
std::cout << "ID: " << std::endl;
int id;
is >> id;
Student s(name, age, id);
*this = s;
}
std::istream & operator>>(std::istream & is, Student & st){
st.read(is);
return is;
}Stack Overflow用户
回答已采纳
发布于 2014-05-30 18:24:37
这是编译吗？
Table[i] = *temp;Table是指向Person的指针数组。
temp是指向Person的指针
您正在尝试将一个对象放入一个包含指针的数组中。解除引用*temp为您提供了一个对象--您需要一个指向对象的指针，所以不要在那里取消引用。我希望编译器会抱怨.是吗？
另外，检查您的第二条if语句--它写的是(choice == 'S' || choice == 'p')，这可能不是您的意思。如果选择if‘p’.
在Person::read()中，您只为name分配了一个字符。结果可能会很糟糕..。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/23960915
复制相关文章
相似问题
腾讯云开发者
