• Announce
  • No Quiz Friday
  • Midterm Grades due Friday

• More Reference Parameters (tricky)

  ref.cpp

Chap 7. Class Interfaces, Design, and Implementation

• Switch Statement

  switch ( expression )

  {

  case constant1:

  statement list;

  break;

  case constant2:

  statement list;

  break;

  ...

  default:

  statement list;

  }

• Example Using the Switch Statement
  • Tallies (car occupancy)

• Work on Class Design: The Quiz Class
  First look at traditional style program
  simpquiz2.cpp

  Consider a Class Design: Requirements

  1. More than one kind of question
  2. Several students share keyboard
  3. More than one chance to answer

  Class Design: Assigning Responsibilities

  • Student
    • Construct using name
    • RespondTo a question
    • GetScore
    • GetName
  • Quiz
    • ChooseKindOfQuestion
    • AskQuestion of/GiveQuestion to a student
  • Question
    • Create/Construct question type
    • AskQuestion
    • Get CorrectAnswer

  Implementing and Using Classes

  • Iterative Enhancement
  • Using Stubs
    • Sometimes partial function
    • Sometimes announce only
    • Sometimes totally empty

  teststudent.cpp
question.h

  Other Practical Issues

  • Handling different kinds of questions
  • String return type for answer
  • string tostring(int)
  • string tostring(double)

  Question Class

  mathquest.h

  mathquest.cpp

  • Initializer Lists

  Initializer Lists - Syntax

  ClassName::ClassName()

  :

  myVar1(argument),

  myVar2(argument),

  ...

  myVarN(argument)

  {// begin constructor body ...

  Quiz Program

  • Includes Student and Quiz Classes

  quiz.cpp

  Going for Class