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Author: rudrajit1729

Part 8 - Object Oriented Programming/Class Across Files/main.cpp

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+
+#include<iostream>
+#include "user.h"
+#include "teacher.h"
+#include "student.h"
+using namespace std;
+
+void show_identity(User &user)
+{
+ user.output();
+}
+
+// Run using g++ main.cpp teacher.cpp student.cpp user.cpp -std=c++11 followed by ./a
+int main()
+{
+ User user;
+ show_identity(user);
+
+ Teacher teacher;// see the hierarchy of inheritance in output
+ // Polymorphism with base
+ User &u1 = teacher;
+ show_identity(u1);
+
+ Student student;// see the hierarchy of inheritance in output
+ User &u2 = student;
+ show_identity(u2);
+
+ /*
+ Polymorphism - Function Override in sub class
+ teacher.output();
+ student.output();
+ */
+}

Part 8 - Object Oriented Programming/Class Across Files/student.cpp

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+#include "student.h"
+void Student::output()
+{
+ cout<<"I am a student\n";
+}
+
+Student::Student()
+{
+ cout<<"Student Created\n";
+}

Part 8 - Object Oriented Programming/Class Across Files/student.h

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+#ifndef STUDENT_H
+#define STUDENT_H
+#include "user.h"
+class Student : public User // Inheritance
+{
+ public:
+ void output();
+ Student();
+};
+#endif

Part 8 - Object Oriented Programming/Class Across Files/teacher.cpp

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+#include "teacher.h"
+using namespace std;
+
+void Teacher::output()
+{
+ cout<<"I am a teacher"<<endl;
+}
+
+Teacher::Teacher()
+{
+ cout<<"Teacher created\n";
+}

Part 8 - Object Oriented Programming/Class Across Files/teacher.h

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+#ifndef TEACHER_H
+#define TEACHER_H
+
+#include<iostream>
+#include "user.h"
+#include <vector>
+
+class Teacher : public User // Inheritance
+{
+ public:
+ vector <string> classes_taking;
+ void output();
+ Teacher();
+};
+#endif 

Part 8 - Object Oriented Programming/Class Across Files/user.cpp

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+#include "user.h"
+#include<iostream>
+using namespace std;
+
+//If any class member methods needs definition do it here
+// int User::func(param)
+// {
+// //Body
+// }
+User::User()
+{
+ cout<<"User Created\n";
+}
+void User::output()
+{
+ cout<<"I am an User\n";
+}
+
+// Friend functions can access private members of class outside the class - using friend functions to access private data members here
+ostream & operator << (ostream & output, User user)
+{
+ output <<"First Name : "<<user.first_name<<"\nLast name : "<<user.last_name
+ <<"\nStatus : "<<user.status;// Accessing private data members
+ return output;
+}
+
+istream & operator >> (istream & input, User &user) // Pass by reference else input here will not be effected in function call area
+{
+ input>>user.first_name>>user.last_name>>
+ user.status; // Accessing private data members
+ return input;
+}

Part 8 - Object Oriented Programming/Class Across Files/user.h

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+#ifndef USER_H
+#define USER_H
+#include<iostream>
+using namespace std;
+class User
+{
+ string status;
+ public:
+ string first_name, last_name;
+ friend ostream & operator << (ostream & output, User user);
+ friend istream & operator >> (istream & input, User & user);
+ User();
+ virtual void output(); // Polymorphism - Function to be overwrritten in sub classes
+};
+#endif