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Computer Science II " Week 5O =v$CS 12: Intro. to Computer Science IIWagner Truppel Lecturer, Dept. of Computer Science & Engineering UC Riverside wagner@cs.ucr.edu http://www.cs.ucr.edu/~wagner http://www.cs.ucr.edu/cs12zO  tO`ta~t$This Week s TopicsIntro to Object-Oriented Programming Procedural Programming Object-Oriented Programming Object-Oriented Programming (OOP) Classes UML Constructors Static members%4"(%4(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 gObject-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  8TProgramming 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 structures Member 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&(Recall this example&  class Point { private: int x; int y; public: Point(int ax, int ay); // this is a constructor int getX(); // this is an accessor function int getY(); // this is an accessor function void setX(int ax); // this is a mutator function void setY(int ay); // this is a mutator function };Z ZZZZZ $         $    *    *               ' ConstructorsSpecial kind of member function Used to initialize member variables More generally, used to initialize the state of the object being created Automatically invoked when declaring a class variable (an object of the class) Must have the same name as the class they re defined for No return type (not even void) You can have more than one Not invoked like other functions (more on this later)  KlI3(.Declaring constructors&  class Point { private: int x; int y; public: Point(int ax, int ay); // this is a constructor int getX(); // this is an accessor function int getY(); // this is an accessor function void setX(int ax); // this is a mutator function void setY(int ay); // this is a mutator function };             $    *    *               ).Declaring constructors&  *,Defining constructors& Somewhere on the same file, after the class declaration 2 ways to declare a constructor: Point::Point(int ax, int ay) { x = ax; y = ay; // we could now verify the input } Point::Point(int ax, int ay) : x(ax), y(ay) { // this body does not have to be empty ! // we can use it to verify the input } The second one is considered preferable (it s more efficient)@ZZZ2ZZZ.ZNZZ?ZY 2   "      9  >tg: e>+,Defining constructors&  ,,Invoking constructors& bImplicitly: Point corner(3, 7); DayOfYear holiday(2, 17); Explicitly: Looks like a regular call to a function returning a value. Looks are deceiving& Point corner = Point(3, 7); DayOfYear holiday = DayOfYear(2, 17); Watch out& Point corner; // also calls a constructor ! DayOfYear holiday; // same here&  /  M /  M  P   A -,Invoking constructors& %Recall that int x; declares the variable x, allocates space for it, but does not set its value Object declaration is similar Point p; declares p as an object of class Point, allocates space for it, but also calls a constructor But which constructor? We only defined one and it takes arguments~ #. C .,Invoking constructors& :Object declaration is similar Point p; declares p as an object of class Point, allocates space for it, but also invokes a constructor But which constructor? We only defined one and it takes arguments The invoked constructor is Point() But we didn t define it, so the compiler complainsV C3/,Invoking constructors& The no-argument constructor is called the default constructor If you don t define any constructor for your class, the compiler automatically creates one for you - the default constructor But if you do define any constructor, the compiler will not create the default for you In such a case, declaring an object as in Point p; is an error (unless one of the constructors you defined is the default)  F=0,Invoking constructors& 2What if you do define the no-argument constructor? How do you invoke it? DayOfYear today; DayOfYear today = DayOfYear(); Compare with DayOfYear today(2, 11); DayOfYear today = DayOfYear(2, 11); For a good example that puts it all together, look at the BankAccount class on pp. 363-368 of the textbookvIZ2ZZ?ZkZ   I      D %1Passing objects to functions<Objects are typically  heavy (have lots of internal stuff) Better never to pass them by value but, instead, by reference (to avoid copying) But what if you don t want to change the object s internal state? Use const void drawRect(const Rectangle& rect, const Color& color)tEb 2A concrete example class Rectangle { private: Point top_left; Point bottom_right; public: Rectangle(Point topL, Point botR); Point getTopLeft() const; Point getBottomRight() const; void setTopLeft(Point p); void setBottomRight(Point p); int getWidth() const; int getHeight() const; };Z Z$ ZZ ZZ $6        I          V     3A concrete exampleRectangle:: Rectangle(Point topL, Point botR) : top_left(topL), bottom_right(botR) {} Point Rectangle::getTopLeft() const { return top_left; } Point Rectangle::getBottomRight() const { return bottom_right; } void Rectangle::setTopLeft(Point p) { top_left = p; } void Rectangle::setBottomRight(Point p) { bottom_right = p; } int Rectangle::getWidth() const // assuming x grows to the right { return (bottom_right.x - top_left.x); } int Rectangle::getHeight() const // assuming y grows downwards { return (bottom_right.y - top_left.y); }ZV  " 6 > L I   "   U Q4Another use for constSometimes we don t want a member function of a class to change the state of the object on which it s invoked Rectangle r = Rectangle(Point(2, 3), Point(10, 17)); cout <<  Width =  << r.getWidth() << endl; <ncncP|'5 Static members"Sometimes we want to have a member variable which is shared by all objects of a given class Example: a count of how many objects have been created Such variables are not tied to any one object in particular Member variables like this are called static member variables They are a sort of global variable They must be initialized only once They must be initialized outside the class they re defined inXZ06!Static member variables5class Connection { private: // private members public: Connection(); // default constructor static int connCount; // public just as an example // other public members }; int Connection::connCount = 0; Connection::Connection() { if (connCount > 10) ; // should raise an exception (an error) connCount++; }Z Z ZZp ZTZ+ZZ %    7    0+b9  + 7"Static member variablesHow do you access them? 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