CPS 6, Ramm - Summer Semester I - 6/5/01 #13

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7. Class Interfaces, Design, and Implementation

Work on Class Design: The Quiz Class
First look at traditional style program
simpquiz2.cpp
Consider a Class Design: Requirements
1. More than one chance to answer
Class Design: Assigning Responsibilities
- Question
  
  Create/Construct question type
  AskQuestion
  Get CorrectAnswer
Implementing and Using Classes
- Using Stubs
  
  Sometimes partial function
  Sometimes announce only
  Sometimes totally empty
teststudent.cpp
question.h
Other Practical Issues
- 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
Preprocessor

#include files, missing?
#ifndef, #define, #endif
multiple copies of include files

Compiler

Syntax Errors

Linker

Undefined symbols
Missing modules

Alternate Question Class (State Capitals)

Includes Student and Quiz Classes

capquest.cpp, capquest.h
Frogs that can't make up their minds ...

frogwalk.cpp

Random Walks (1-D)

Physics
Statistical
Coin Toss
Frog Example
Gambling Example

Random Walk Class

walk.h
walk.cpp

Random Walks (2-D)

Brownian Motion

Passing a Class by Value/Reference

Done for strings many times...

scopedice.cpp

Structs

Similarity to Class

All Public, No Private
Can Have Member Functions

An Aggregate of Dissimilar Types
Example (without member functions)

struct Student { string name; int height; // height in inches double weight; // weight in pounds string dob; // date of birth mm/dd/yy
}

Chap 8. Arrays, Data, & Random Access

Concepts
- Arrays, Vectors
A Counting Problem
gradefreq1.cpp gradefreq2.cpp
gradefreq3.cpp
Vector Vocabulary
- last always at N-1