Question

c++

Please write an implementation of the copy constructor.
Please write an implementation of the assignment operator.

Problem #3: The implementation below will CRASH because it’s missing a copy constructor and an assignment operator. #include <iostream> using namespace std;

class Triangle { public: Triangle() { p = new Point[3]; } Triangle(int x1,int y1,int x2, int y2,int x3,int y3) { p = new Point[3]; p[0].x = x1; p[0].y = y1; p[1].x = x2; p[1].y = y2; p[2].x = x3; p[2].y = y3; } Triangle::~Triangle() { delete [] p; } private: struct Point { int x,y; Point(int px=0,int py=0): x(px), y(py) { } }; Point *p; };

int main() { Triangle *array[3]; array[0] = new Triangle(1,1,1,3,3,1); array[1] = new Triangle(2,2,2,6,6,2); array[2] = new Triangle(3,3,3,9,9,3); Triangle c2 = *array[0]; c2 = *array[1];

for(int i=0;i<3;i++) delete array[i]; }

Answer 1

#include <iostream>
using namespace std;

class Triangle {
   public:
  
   Triangle() {
       p = new Point[3];
       }
  
   Triangle(int x1,int y1,int x2, int y2,int x3,int y3)
   {
       p = new Point[3];
       p[0].x = x1;
       p[0].y = y1;
       p[1].x = x2;
       p[1].y = y2;
       p[2].x = x3;
       p[2].y = y3;
      
   }
  
   Triangle(const Triangle &t) // copy constructor
   {
       p = new Point[3];
       p[0].x = t.p[0].x;
       p[0].y = t.p[0].y;
       p[1].x = t.p[1].x;
       p[1].y = t.p[1].y;
       p[2].x = t.p[2].x;
       p[2].y = t.p[2].y;
      
   }
  
   void operator =(const Triangle &t) // assignment operator
   {
       p = new Point[3];
       p[0].x = t.p[0].x;
       p[0].y = t.p[0].y;
       p[1].x = t.p[1].x;
       p[1].y = t.p[1].y;
       p[2].x = t.p[2].x;
       p[2].y = t.p[2].y;
      
   }
  
   ~Triangle() {
       delete [] p;
       }
  
   private:
  
   struct Point {
      
       int x,y;
      
       Point(int px=0,int py=0): x(px), y(py) { }
       };
      
       Point *p;
  
  
};

int main() {
  
   Triangle *array[3];
  
   array[0] = new Triangle(1,1,1,3,3,1);
  
   array[1] = new Triangle(2,2,2,6,6,2);
  
   array[2] = new Triangle(3,3,3,9,9,3);
  
   Triangle c2 = *array[0];
  
   c2 = *array[1];

for(int i=0;i<3;i++)

delete array[i];
  
  
}

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