new int ???

[Chathu]

What does the new keyword mean?

#include <iostream>
using namespace std;

class CRectangle {
    int *width, *height;
  public:
    CRectangle (int,int);
    ~CRectangle ();
    int area () {return (*width * *height);}
};

CRectangle::CRectangle (int a, int b) {
  width = new int;//this 
  height = new int;//this
  *width = a;
  *height = b;
}

CRectangle::~CRectangle () {
  delete width;
  delete height;
}

int main () {
  CRectangle rect (3,4), rectb (5,6);
  cout << "rect area: " << rect.area() << endl;
  cout << "rectb area: " << rectb.area() << endl;
  return 0;
}

[Athar]

http://www.cplusplus.com/doc/tutorial/dynamic/

However, let it be said that in this example it is a horrible idea to use dynamic allocation.

[Moschops]

It means "make an object of this type in the heap memory space and give me back a pointer to it"

http://www.cplusplus.com/doc/tutorial/dynamic/

[Chathu]

one thing i want to know.

width = new int;//the size of width in here is 4 cos it is an integer or bcoz it is a pointer?

//if we assign like below
width = new int[5];//the size of width is 5 right? I'm not sure about the correction of the code   

[Athar]

width is a pointer, so it will be the size of a pointer in both cases.

[Chathu]

Thanks a lot :)