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