Access Specifiers - Advanced Programming - Lecture Slides, Slides of Computer Science

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Classes

Access Specifiers

Accessing Rights

• Private: Member Functions of the Class and its

Friends

• Protected: Member Functions and Derived

Classes

• Public: Entire World
• Thumb Rule -- Data Members are Private and

Member Functions are Public

Accessing Rights – Example 1 (cont)

• // date.cpp

#include “date.h”

date::date(char *ip_date){

day = 0; month = 0; year = 0;

string_date = new char [size];

strcpy(string_date, ip_date);}

date::~date() {delete[] (string_date);}

void date::print_date() {cout << "Date is: "

<< string_date << endl;}

Accessing Rights – Example 1 (cont)

• // client.cpp

#include “date.h” main(){ date today("June 19, 1995"); // ERROR cout << "Date is: " << today.string_date << endl; today.print_date(); //CORRECT }

Accessing Rights – Example 2 ….

• // student.cpp #include student.h /* Member functions of the “Student" class */ Student ::Student(char *studentName, char *studentId, char *studentEmail){ name = new char[size]; strcpy(name, studentName); id = new char[size]; strcpy(id, studentId); email = new char[size]; strcpy(email, studentEmail); } Student::~Student(){ delete [] name; delete [] id; delete [] email; } void Student::printData(){ cout << “Name: ” << name << endl << “ID : ” << id << endl << “Email : ” << email << endl;}

Accessing Rights – Example 2 ….

• // client.cpp

#include “student.h”

/* “csStudent1" is an instance of “Student" */

main(){

Student csStudent1 ("Susie Creamchese“,

"screamch@iupui.edu");

csStudent1.printData();