Intro

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Types of Programming

Structured:

• break apart into functions/subroutines.modules

Object Oriented Programming:

• combining data and code into self contained groupings

Functional:

• use of math like functions to organize code into reuseable blocks

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Uses

• Games
• GUIs
• Web Services

All are long-lived state frequently accessed

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Classes

• Constructor
• Method
• fields/properties/memer variable
• instances
  • a specific one of a blueprint
• access restrictions

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Encapsulation

  #include <iostream> // Allows us to read to or write from the console
  #include <istream>
  
  string readContnents(string filename);
  ifstream input(filename);
   
  int fileId;
  int readPos;
   
  int i;
  input >> i; 
  
  cin >> i;

Have classes to group and create simplier interfacee

• Show interface
• Hide implementation

##ifstream:

• subclass of istream
• cin is a different istream sub class

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Cohesion vs Coupling

• Cohesion is how well things go together
• Coupling is how much different things are mixed together

Minimum interactions needed, coupling is necessary, but want to minimuze it.
0% coupling is just a bunch of different functions that dont interact with each other at all.
Want to try to keep functions small (about 10 lines).

class Student {
  private:
  string firstName;
  string lastName;
  char middleInitial;
  long studentId;
  string major;
  
  public:
  string makeFormalName(){
    return lastName + ", " + firstName + " " + middleInitial + "."
  }
  
}

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Class designer vs. Client

• Class designer, come up with interface, implementation
• Client, has to use the class

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