programming-examples/c++/Others/An Array of Pointers to Class.cpp

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2019-11-15 12:59:38 +01:00
An Array of Pointers to Class
This program is an example of using an array of pointers to a class.
After declaring the array, you can allocate memory for each element using the new operator.
To access a member variable or a method of an element, you can use the -> operator:
#include <iostream>
using namespace std;
class CSquare
{
public:
double Side;
CSquare() : Side(0.00) {}
CSquare(double side) : Side(side) { }
~CSquare() { }
double getSide() const { return Side; }
void setSide(const double s)
{
if( s <= 0 )
Side = 0.00;
else
Side = s;
}
double Perimeter() { return Side * 4; }
double Area() { return Side * Side; }
};
int main()
{
CSquare *sqr[4];
sqr[0] = new CSquare;
sqr[0]->setSide(24.55);
sqr[1] = new CSquare;
sqr[1]->setSide(15.08);
sqr[2] = new CSquare;
sqr[2]->setSide(8.212);
sqr[3] = new CSquare;
sqr[3]->setSide(202.24);
cout << "Squares Characteristics" << endl;
cout << "Square 1" << endl;
cout << "Side: " << sqr[0]->getSide() << endl;
cout << "Perimeter: " << sqr[0]->Perimeter() << endl;
cout << "Area: " << sqr[0]->Area() << endl;
cout << "Square 2" << endl;
cout << "Side: " << sqr[1]->getSide() << endl;
cout << "Perimeter: " << sqr[1]->Perimeter() << endl;
cout << "Area: " << sqr[1]->Area() << endl;
cout << "Square 3" << endl;
cout << "Side: " << sqr[2]->getSide() << endl;
cout << "Perimeter: " << sqr[2]->Perimeter() << endl;
cout << "Area: " << sqr[2]->Area() << endl;
cout << "Square 4" << endl;
cout << "Side: " << sqr[3]->getSide() << endl;
cout << "Perimeter: " << sqr[3]->Perimeter() << endl;
cout << "Area: " << sqr[3]->Area() << endl;
return 0;
}