Project 2 - C++ created by Ayysir - https://repl.it/@Ayysir/Project-2-C

Project 2 - C++.cpp

#include <iostream>
#include <string>
#include <vector>
#include <math.h>

class Shape {
 public:
  virtual float calculateArea() = 0;
  virtual ~Shape(){};
  std::string name;
};
class Rectangle : public Shape {
 private:
  float width, height;

 public:
  Rectangle() {}
  Rectangle(float w, float h) {
    width = w;
    height = h;
    name = "Rectangle";
  }
  float calculateArea() {
    float area;
    area = width * height;
    return area;
  }
};
class Circle : public Shape {
 private:
  float radius;

 public:
  Circle() {}
  Circle(float r) {
    radius = r;
    name = "Circle";
  }
  float calculateArea() {
    float area;
    area = 3.141 * radius * radius;
    return area;
  }
};

class Triangle : public Shape {
 private:
  float side1, side2, side3;

 public:
  Triangle() {}
  Triangle(float s1, float s2, float s3) {
    side1 = s1;
    side2 = s2;
    side3 = s3;
    name = "Triangle";
  }
  float calculateArea() {
    float area;
    float s;
    s = (side1 + side2 + side3) / 2;
    area = sqrt(s * (s - side1) * (s - side2) * (s - side3));
    return area;
  }
};

int main() {
  std::vector<Shape*> shapes;
  shapes.push_back(new Rectangle(6, 2.5));
  shapes.push_back(new Circle(4));
  shapes.push_back(new Triangle(7, 8, 9));
  for (int i = 0; i < shapes.size(); i++) {
    std::cout << "area of " << shapes[i]->name << " is "
              << shapes[i]->calculateArea() << std::endl;
  }

  for (int i = 0; i < shapes.size(); i++) {
    delete shapes[i];
  }

  return 0;
}