60 lines
1.0 KiB
C++
60 lines
1.0 KiB
C++
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#include <cmath>
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#include <iostream>
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using namespace std;
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class Figure {
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public:
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virtual double square() = 0;
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};
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class Triangle: public Figure {
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private:
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double a, b, c;
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public:
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Triangle(double a, double b, double c);
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double square();
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};
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class Rectangle: public Figure {
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private:
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double a, b;
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public:
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Rectangle(double a, double b);
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double square();
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};
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class Trapezoid: public Figure {
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private:
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double a, b, h;
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public:
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Trapezoid(double a, double b, double h);
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double square();
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};
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Triangle::Triangle(double a, double b, double c) {
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this->a = a;
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this->b = b;
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this->c = c;
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}
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double Triangle::square() {
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double p = (this->a + this->b + this->c)/ 2;
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return sqrt(p * (p - this->a) * (p - this->b) * (p - this->c));
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}
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Rectangle::Rectangle(double a, double b) {
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this->a = a;
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this->b = b;
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}
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double Rectangle::square() { return this->a * this->b; }
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Trapezoid::Trapezoid(double a, double b, double h) {
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this->a = a;
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this->b = b;
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this->h = h;
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}
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double Trapezoid::square() { return (this->a + this->b) / 2 * this->h; }
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