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23 lines
313 B
23 lines
313 B
#include "polygon.h"
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#include <cmath>
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class triangle : public polygon
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{
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public:
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virtual double area() const
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{
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return side_length_ * side_length_ * sqrt(3) / 2;
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}
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};
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// the class factories
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extern "C" polygon* create()
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{
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return new triangle;
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}
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extern "C" void destroy(polygon* p)
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{
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delete p;
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}
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