Why to use OOP next stage in the software engineering evolution: - structural - procedural - modular tool for implementing OO projects (there is OO analysis, OO design) languages that sup...
A structural example - person struct person { int age; char FName[20], LName[30]; }; void person_input(person *o); void person_set(person *o, int age, char *pFN, char *pLN); void person_output(person *o); no access control over data members the programmer is responsible for using proper functio...
An OO example - person class person { int age; // class members - class variables char FName[20], LName[30]; public: void input(); // class members - class methods void set(int age, char *pFN, char *pLN); void output(); }; // declaration ends with „ ; ” data and methods together default for cla...
Calling a constructor Constructor with no args (default constructor): point p1; Others: point p3(10.0, 20.0); // 2 arg. point p2(1.0); // 1 arg. // point p1(); // this would be a call of p1 function point p2=1.0; // this way 1 arg. con. on...
Constructor - not a normal method We don't specify the returned value (even void) We cannot call it for an already constructed object We cannot get it's address It is not even visible in the class scope and has no name ...
Constructor and destructor for d erived class Cconstructors are not inherited, but: Order of constructor calls: 1. virtual base classes 2. non-virtual base classes 3. member objects 4. the class constructor Destructorss - reverse order ...
Constructor declaration For the T class: T(args); or T::T(args); class point { double x, y; public: // … point(double, double); // no return value, even void! point(double); // overloadable point(); }; ...
Constructor Constructor - method used for initializing objects of a given class - an algorithm for creating object of a given class When to define it - if class variables need initialization - if something should be done when a new object ...
Default assignment operator if we do not define an assignment operator, then the compiler generates one, that simply copies objects field by field - it does not work for const fields - it does not work for reference fields - it simply copies pointer...
Operators as functions at least one argumen t of the operator should be an object all the arguments are operator function parameters there is no this declaring int operator...
