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Computer Science II " Lecture 8O =2Introduction to OOPWagner Truppel Lecturer, Dept. of Computer Science & Engineering UC Riverside wagner@cs.ucr.edu http://www.cs.ucr.edu/~wagner http://www.cs.ucr.edu/cs12O  O`a~ Procedural ProgrammingTFunctions, functions, functions& Characteristics: Typically top-down Hard to encapsulate access to memory Hard to reuse Hard to debug and maintain Relatively low overheadb2ZZN  Z +Z2 g Object-Oriented ProgrammingObjects, objects, and more objects& Characteristics: Typically bottom-up Easy to encapsulate access to memory Easy to reuse Easier to debug and maintain Relatively large overhead compared to procedural programming5ZZP +Z=  Z5  8T Programming LanguagesProcedural only C, Pascal and other older languages Procedural and Object-oriented C++ Object-oriented only Java There are many others Smalltalk, Eiffel, C#, Python, Perl,etcZ$ZZZZZZ)Z$ ) ClassesVariables are containers for values of specific data types Variables of built-in data types: their values are numbers (int, long, float, double), characters (char), and booleans (bool) Pointers are also data types; their values are other variables Classes are the data types whose values are objects Classes define Content objects have their own memory (member variables) Behavior objects have code (member functions) they can execute on demandR;ZZZZ Z@Z ?] - %                  Pw/ \Representing ClassesUML (Unified Modeling Language) Standard way to describe classes and their relationships within a program Very useful  you should learn more about it (but I won t ask you for more than the absolute basics here in CS 12)ZZZ  Jo,ClassesClasses often form hierarchies A subclass may inherit (ie, may have direct access to) the member variables and/or the member functions of its superclass (also called base class) We ll talk more about inheritance later onZ Y    ,7U DClasses in C++Are very much like structuresMember functions8We ve seen how to declare them inside the class definition. How to implement them ? Same way as always, but must include the class name the member function belongs to Point Rectangle::getTopLeft() { return top_left; } Point Rectangle::getBottomRight() { return bottom_right; } Note that inside the function you can refer to the member variables directly by name The :: is the scope resolution operatorZ7ZZ?Z~Z $ ,Yt } The Principle of EncapsulationAn object s inner details should not be anyone s business but its designer s Take a built-in data type, such as an int Do we really know how it is implemented? No! Do we care? Most of the time, no! Should we care? Not really. Can we still use it effectivelly? Yes!4wZZs,s  The Principle of Encapsulation Built-in data types aren t objects (no class definition for them!) but they are Abstract Data Types An ADT is an entity about which all we know and care are: its interface (syntax) its behavior (semantics)Z0ZM 4   Syntax x SemanticsBSyntax refers to what is acceptable according to the rules of a language Semantics refers to what is acceptable meaning or behavior  Me not sleep yesterday. is not syntactically correct English  My pet mosquito took my computer out on a date. is syntactically correct but makes no sense"ZC 4 /) The Principle of EncapsulationAn ADT is an entity about which all we know and care are: its interface (syntax) and its behavior (semantics) All we care about an int is that it represents integer numbers, that is, we can apply to them the operations add, subtract, multiply, and so on (semantics!) The way to do so is, say, 7 + 2, not 7 2 + or some other expression (syntax!) The interface of an ADT defines its syntax The axioms of an ADT define its behavior We ll cover ADT axioms in more detail in CS 14Z8 # $  "NW The Principle of EncapsulationdGood object-oriented design recommends that all member variables and all internally used member functions should be hidden from users of the class defining them Sometimes there are valid reasons to break encapsulation, but until you re more experienced with OOP, you should always hide your classes guts Other advantages of encapsulating a class member variables: Enforcement of preconditions and postconditions Aids in debuggingqZBZ,$ ' r =B,3^The Principle of EncapsulationHow to encapsulate (hide) a class inner details ? Be private about them& class Point { private: int x; int y; public: Point(int x, int y); // this is a constructor int getX(); // this is an accessor function int getY(); // this is an accessor function void setX(int x); // this is a mutator function void setY(int y); // this is a mutator function };@KZZ  Z Z Z ZZ6   " $)) b     Structures & ClassesStructures may have private member variables as well, not just public ones Structures may have private and public member functions too In fact, everything you can do with classes, you can also do with structures The only difference is that if you omit the access modifiers (private, public), then Classes assume private Structures assume public Why two names for the same idea? C++ is C on steroids, so it requires structures for compatibility C++ is an OO language, so it requires classesr)Z0Z!ZpZ0!p/PsxHH@Rg(HH(dh   ` www3ff` 3fff` ___>?" dF@,?n<d@uA @ " d`  n?" dd@   @@``PR   @ ` `P0p>> - 2003 WL Truppel ZCS 12: Intro. Computer Science II " Lecture 8 X( = 2  Npj?"! :    Nagֳgֳ ?"`  T Click to edit Master title style! !<  Hfgֳgֳ ?"  RClick to edit Master text styles Second level Third level Fourth level Fifth level!     S  NPfgֳgֳ ?"`p  Z*    Njgֳgֳ ?"`   \*     Nbgֳgֳ ?"`@  \*   N  6n޽h? ? www3ff $Blank Presentation1  - 2003 WL Truppel ZCS 12: Intro. Computer Science II " Lecture 8 +#  ( |  B  N1?"442  NPc?"! :    Ndgֳgֳ ?"` D T Click to edit Master title style! !  Hcgֳgֳ ?"P  D W#Click to edit Master subtitle style$ $  Nbgֳgֳ ?"`p D Z*    N0hgֳgֳ ?"`  D \*     NLgֳgֳ ?"`@ D \*   N  6n޽h? ?  www3ffм P<f(  < < 0@} "P   ה R*   < 0`~ "   ה T*  r < c $ ?"  ה$ < 0 " @ ה RClick to edit Master text styles Second level Third level Fourth level Fifth level!     S < 6 "`P  ה R*   < 6` "`  ה T*  H < 0޽h ? ̙33> `D( @ $  D D 0 "P   ה ACS 12 Lecture 8  D 0 "   ה T*   D 6 "`P  ה ACS 12 Lecture 8  D 6 "`  ה T*  H D 0޽h ? ̙33  0 L(  P   c $F "0P D   c $N "P  D B  s *޽h ? 3ff   p\D(  \l \ C P`  D l \ C    D $ \ C A fig1a.pdf 0011D0F4Earth B9B583FF: H \ 0޽h ? www3ff(    `P(  `r ` S 0`  D r ` S    D $ ` C A fig1b.pdf  0011D0F4Earth B9B583FF: H ` 0޽h ? www3ff    h( 00// hl h C `  D l h C  D H h 0޽h ? www3ff(    lP( 00// lr l S p`  D r l S  D $ l C A fig1c.pdf 0011D0F4Earth B9B583FF: `` H l 0޽h ? www3ff(    pP( | pr p S `  D r p S  p D $ p C A fig2a.pdf 0011D0F4Earth B9B583FF:@` H p 0޽h ? www3ff(   tP( 0  tr t S P`  D r t S p p D $ t C A fig2b.pdf 0011D0F4Earth B9B583FF: 0  H t 0޽h ? www3ff       |3 (  |l | C `  D l | C P  D  | HЦgֳgֳ ?P 0  &class Point { public: int x; int y; };