Classes Access Specifiers

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Classes Access Specifiers
Department of Computer and Information
Science,School of Science, IUPUI
CSCI 240
Dale Roberts, Lecturer Computer Science,
IUPUI E-mail droberts_at_cs.iupui.edu
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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

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Accessing Rights Example 1

• // date.h/ A Simple Date Class With a Proper
  Accessing / define size 50 class date
  private int day, month, year char
  string_date public date(char ip_date)
  //Constructor date() //Destructor void
  print_date() //Member Function

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Accessing Rights Example 1 (cont)

• // date.cppinclude date.hdatedate(char
  ip_date) day 0 month 0 year 0
  string_date new char size
  strcpy(string_date, ip_date) datedate()
  delete (string_date) void
  dateprint_date() cout ltlt "Date is " ltlt
  string_date ltlt endl

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Accessing Rights Example 1 (cont)

• // client.cppinclude date.hmain() date
  today("June 19, 1995") // ERROR cout ltlt
  "Date is " ltlt today.string_date ltlt endl
  today.print_date() //CORRECT

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Accessing Rights - Example 2

• // student.h/ A Simple Class to Represent a
  Student /define size 50class Student 
  private char name char id char email 
  public Student(char , char , char
  ) Student() void printData()

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Accessing Rights Example 2 .

• // student.cppinclude student.h/ Member
  functions of the Student" class /Student
  Student(char studentName, char studentId,
  char studentEmail) name new charsize
     strcpy(name, studentName) id new
  charsize    strcpy(id, studentId) email
  new charsize    strcpy(email,
  studentEmail)StudentStudent() delete
  name delete id delete
  emailvoid StudentprintData() cout ltlt
  Name ltlt name ltlt endl ltlt ID ltlt id
  ltlt endl ltlt Email ltlt email ltlt endl

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Accessing Rights Example 2 .

• // client.cppinclude student.h/
  csStudent1" is an instance of Student"
  /main()    Student csStudent1 ("Susie
  Creamchese, "123456789,
  "screamch_at_iupui.edu") csStudent1.printData()
  

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Acknowledgements

• These slides were originally prepared by Rajeev
  Raje, modified by Dale Roberts.