• Announce
  • Quiz Friday (3/3/00)

Chap 7. Class Interfaces, Design, and Implementation

• 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

  }

• Concepts
  • Random Access
  • Sequential Access
  • Arrays, Vectors

• A Counting Problem

  gradefreq1.cpp

  gradefreq2.cpp

  gradefreq3.cpp

• Vector Vocabulary
  • Homogeneous Collection (Aggregate)
  • N cells/elements
  • index/subscript (0, 1, ..., N-1)
  • always start at 0
  • last always at N-1

• Vector Creation and Use

  tvector<int> num(6);

  +--+--+--+--+--+--+

  | ?| ?| ?| ?| ?| ?|

  +--+--+--+--+--+--+

  --0--1--2--3--4--5-

  
  

  num[1] = 21; num[5] = 13;

  +--+--+--+--+--+--+

  | ?|21| ?| ?| ?|13|

  +--+--+--+--+--+--+

  --0--1--2--3--4--5-

  
  

  int k;

  for (k=2; k<6; k++) num[k] = k*k;

  +--+--+--+--+--+--+

  | ?|21| 4| 9|16|25|

  +--+--+--+--+--+--+

  
  

  int j;

  for (j=0; j<6; j++) cout << num[k] << " ";

  
  

  ? 21 4 9 16 25