Class and Object DeepDive C++

1 Accessing and Creating Properties .cpp

#include<iostream>
using namespace std;
class Dog{
public :
string name;
int age;
float weight;

};
int main(){

Dog bobo;
Dog puppy;
bobo.age=5;
bobo.name="bobo";
puppy.age=3;
bobo.weight=5.5;
puppy.weight=3.2;
cout<<"My Dog name is "<<bobo.name<<endl;
cout<<"Age of bobo"<<bobo.age<<endl;
cout<<"Age of puppy"<<puppy.age<<endl;
return 0;
}

2 private and public.cpp

#include <iostream>
using namespace std;
class Book {
  private:
    int year;
    double price;
  public:
    string title;
    void printBook();
    void setPrice(double p);
    void setYear(int y);
} book;
void Book::setPrice(double p) {
  price = p;
}
void Book::setYear(int y) {
  year = y;
}
void Book::printBook() {
  cout << "Title: " << title << "\n";
  cout << "Price: " << price < "\n";
  cout << "Year: " << year << "\n";
}
int main() {
  book.title = "hooked";
  book.setYear(2013);
  book.printBook();
  return 0;
}

3 updatingProgarm2.cpp

#include <iostream>
using namespace std;
class Book { //declaration a class
  private:
    int year;
    double price;
  public:
    string title;
    void printBook();
    void setPrice(double p);
    void setYear(int y);
};
void Book::setPrice(double p) {
  price = p;
}
void Book::setYear(int y) {
  year = y;
}
void Book::printBook() {
  cout << "Title of the book : " << title <<endl;
  cout << "Price of the book : " << price <<endl;
  cout << "Year : " << year << endl;
}

int main() {
    Book book;
int bPrice=0;
cout<<"enter title of the book:";
cin >> book.title;
cout<<"enter price of the book:";
cin>>bPrice;
  
  book.setPrice(bPrice);
  book.setYear(2013);
  book.printBook();
  return 0;
}

4protected.cpp

#include <iostream>
using namespace std;
class Parent {

protected:
    int data;
};
class Child : public  Parent {

public:
    void setData(int id)
    {
        data = id;
    }
    void print()
    {
        cout << "Protected data  is: "
             << data << endl;
    }
};

int main()
{
    Child child;
    child.setData(1001);
    child.print();
    return 0;
}