[PDF] Constructor and Destructor Course Title: Object Oriented Programming





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Constructor and Destructor radius = 0;

Circle :: Circle(double r)

radius = r;

Circle :: Circle(Circle&t)

radius =t.radius; ~Circle() {} #include using namespacestd; class Circle //specify a class private : double radius; //class data members public:

Circle() //default constructor

radius = 0;

Circle(double r) //parameterized constructor

radius = r;

Circle(Circle&t) //copy constructor

radius =t.radius; voidsetRadius(double r) //function to set data radius = r; doublegetArea() return 3.14 * radius * radius; ~Circle() //destructor int main()

Circle c1; //defalut constructor invoked

Circle c2(2.5); //parmeterized constructor invoked

Circle c3(c2); //copy constructor invoked

cout<< c1.getArea()<Circle :: Circle(double r) radius = r;

Circle :: Circle(double r) : radius(r)

#include using namespacestd; class Rectangle private : int length; int width; public: voidsetData(intlen,intwid) length =len; width =wid; intgetArea() return length * width ; friend doublegetCost(Rectangle); //friend of class Rectangle //friend function getCost can access private member of class doublegetCost (Rectangle rect) double cost; cost =rect.length *rect.width * 5; return cost;

int main () { Rectangle floor; floor.setData(20,3); cout<< "Expense "< &1 %2 %3 #include using namespacestd; classCostCalculator; class Rectangle private : int length; int width; public: voidsetData(intlen,intwid) length =len; width =wid; intgetArea() return length * width ; friend classCostCalculator; //friend of class Rectangle //friend class costCalculator can access private member of class

Rectangle

classCostCalculator

{ public : doublegetCost (Rectangle rect) { double cost; cost =rect.length *rect.width * 5; return cost; } };

int main () { Rectangle floor; floor.setData(20,3); CostCalculatorcalc; cout<< "Expense "< &4 %&$''%%5"6' #include using namespacestd; class Complex private : double real; doubleimag; public:

Complex () {};

Complex (double, double);

Complex operator + (Complex);

void print();

Complex::Complex (double r, double i)

real = r; imag = i;

Complex Complex::operator+ (Complex param) { Complex temp; temp.real = real +param.real; temp.imag =imag +param.imag; return (temp); }

void Complex::print() { cout<< real<< " + i"<7%88%8 9%%: =78 c3 = c1.operator+(c2); 2 !. #include using namespace std; class Distance { private: int feet; // 0 to infinite int inches; // 0 to 12 public: // required constructors

Distance(){

feet = 0; inches = 0;

Distance(int f, int i){

feet = f; inches = i; // method to display distance void displayDistance() { cout << "F: " << feet << " I:" << inches <Distance operator- () { feet = -feet; inches = -inches; return Distance(feet, inches); int main() {

Distance D1(11, 10), D2(-5, 11);

-D1; // apply negation

D1.displayDistance(); // display D1

-D2; // apply negation

D2.displayDistance(); // display D2

return 0; 77'
2'4' $$A $ ()*,) 2 !. #include using namespace std; class Box { double length; // Length of a box double breadth; // Breadth of a box double height; // Height of a box public: double getVolume(void) { return length * breadth * height; void setLength( double len ) { length = len; void setBreadth( double bre ) { breadth = bre; void setHeight( double hei ) { height = hei; // Overload + operator to add two Box objects.

Box operator+(const Box& b) {

Box box;

box.length = this->length + b.length; box.breadth = this->breadth + b.breadth; box.height = this->height + b.height; return box; // Main function for the program int main( ) { Box Box1; // Declare Box1 of type Box Box Box2; // Declare Box2 of type Box Box Box3; // Declare Box3 of type Box double volume = 0.0; // Store the volume of a box here // box 1 specification Box1.setLength(6.0); Box1.setBreadth(7.0); Box1.setHeight(5.0); // box 2 specification

Box2.setLength(12.0);

Box2.setBreadth(13.0);

Box2.setHeight(10.0);

// volume of box 1 volume = Box1.getVolume(); cout << "Volume of Box1 : " << volume <Box3 = Box1 + Box2; // volume of box 3 volume = Box3.getVolume(); cout << "Volume of Box3 : " << volume <A %& !!,A void squareInteger(int x) { cout << "In function with integer parameter > " << x * x << endl; void squareFloat(float x) cout << "In function with float parameter > " << x * x << endl; void squareDouble(double x) cout << "In function with double parameter > " << x * x << endl; %3$ ,$quotesdbs_dbs2.pdfusesText_4
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