Question

need some guide here

I got a code which is

struct Point
{
   int x;
   int y;
};

then at my class i got a function

class MyClass
{
   private:
      Point myPoint[4];
   public:
     void setPoint();
};

void MyClass::setPoint()
{
   int xData,yData;

   for (int i=0;i<4;i++)
   {
      cout << "Please enter x-ordinate:";
      cin >> xData;

      cout << "Please enter y-ordinate:";
      cin >> yData;

      //at this part the code throw a segmentation core dump.
      myPoint[i].x = xData;
      myPoint[i].y = yData;
   }

}

On first run nothing happen, but on 2nd loop, segmentation core dump occur. whats wrong with my code?

Additional code on main.cpp

#include "MyClass.h"

int main()
{
MyClass *mClass;

mclass->setPoint();
}

Thanks for helping.

Answer 1

You must allocate memory before use pointer:

int main()
{
    MyClass *mClass = new MyClass ();
    mclass->setPoint();
    return 0;
}