Lab06-09

#include <iostream>
#include <cmath>
#include <string>

#define PI 3.14159

using namespace std;

class Triangle {
    public:
    unsigned sideA;
    unsigned sideB;
    unsigned angle;
    Triangle() {
    }
    Triangle(unsigned sideA, unsigned sideB, unsigned angle) {
        this->sideA = sideA;
        this->sideB = sideB;
        this->angle = angle;
    }
    double calculateSquare() {
        return sideA * sideB * sin(angle * PI / 180) / 2;
    }
    double calculatePerimeter() {
        return sideA + sideB + sqrt(pow(sideA, 2) + pow(sideB, 2) - 2 * sideA * sideB * cos(angle * PI / 180));
    }
};


class IsoscelesTriangle : public Triangle {
    public:
    IsoscelesTriangle(unsigned sideA, unsigned sideB, unsigned angle) : Triangle(sideA, sideB, angle) {
    }
};

class EquilateralTriangle : public Triangle {
    public:
    EquilateralTriangle() {
    }
    EquilateralTriangle(unsigned side) : Triangle(side, side, 60) {
    }
    double calculateSquare() {
        return sqrt(3) / 4 * pow(sideA, 2);
    }
    double calculatePerimeter() {
        return 3 * sideA;
    }
};

class RightTriangle : public Triangle {
    public:
    RightTriangle(unsigned sideA, unsigned sideB, unsigned angle) : Triangle(sideA, sideB, angle) {
    }
};

unsigned promtForSide(string sideName) {
    if (sideName.empty()) {
        cout << "Enter side: ";
    } else {
        cout << "Enter side " << sideName << ": ";
    }
    unsigned side;
    cin >> side;
    return side;
}

unsigned promtForAngle() {
    cout << "Enter angle: ";
    unsigned angle;
    cin >> angle;
    return angle;
}

int main() {
    cout << "Написать программу, в которой описана иерархия классов: треугольник (равнобедренный, равносторонний, прямоугольный)." << endl;
    cout << "Базовый класс должен иметь поля для хранения длины двух сторон и угла между ними. Реализовать методы вычисления площади и периметра фигуры." << endl;
    cout << "Продемонстрировать работу всех методов классов, предоставив пользователю выбор типа треугольника для демонстрации." << endl;
    Triangle *triangle;
    cout << "1) Triangle" << endl;
    cout << "2) Isosceles triangle" << endl;
    cout << "3) Equilateral triangle" << endl;
    cout << "4) Right triangle" << endl;
    unsigned choice;
    do {
        cin >> choice;
    } while(choice < 1 || choice > 4);
    switch (choice) {
        case 1:
        triangle = new Triangle(promtForSide("A"), promtForSide("B"), promtForAngle());
        break;
        case 2:
        triangle = new IsoscelesTriangle(promtForSide("A"), promtForSide("B"), promtForAngle());
        break;
        case 3:
        triangle = new EquilateralTriangle(promtForSide(""));
        break;
        case 4:
        triangle = new RightTriangle(promtForSide("A"), promtForSide("B"), promtForAngle());
        break;
    }
    cout << "Square of triangle: " << triangle->calculateSquare() << endl;
    cout << "Perimeter of triangle: " << triangle->calculatePerimeter() << endl;
}