Ashutosh
Mon Aug 22 23:20:43 CDT 2005
This code is working fine . At the time of deletion i change base object
with Derived class object through c-style type casting:-)(i don't know why
people were talking about make virtual in BASE class[I know the difference
:-p]. My question was why code is giving run time error not how to use
virtual or... :-)
#include<iostream>
using namespace std;
class Base {
private:
int i;
public:
Base(){i = 999;}
void show() {
cout<<"value of i is..."<<i<<endl;
}
};
class Der : public Base {
private:
int d;
public:
Der(){d = 100;}
virtual void show() {
cout<<"value of i is..."<<d<<endl;
}
};
int main() {
Base *obj = new Der;
obj->show();
delete (Der*)obj; // change line ;-)
return 0;
}
"Ashutosh Choubey" <ashutosh_choubey@persistent.co.in> wrote in message
news:u19Ak$ypFHA.2444@tk2msftngp13.phx.gbl...
> Hi all,
>
> I have a problem. When i am deleting object my programe immediately crash.
> I dont know what is the reson behind this.(I think problem is like i am
> delete some stack variable.)
>
> #include<iostream>
> using namespace std;
> class Base {
> private:
> int i;
> public:
> Base(){i = 999;}
> void show() {
> cout<<"value of i is..."<<i<<endl;
> }
> };
> class Der : public Base {
> private:
> int d;
> public:
> Der(){d = 100;}
> virtual void show() {
> cout<<"value of i is..."<<d<<endl;
> }
> };
> int main() {
> Base *obj = new Der;
> obj->show();
> delete obj;
> return 0;
> }
>