(PT) dynamic _ cast error

[greycode05]

hi everyone,

        in the following program i m tyring to use dynamic_cast but 
it is showing a run time error, can any one please rectify the 
error , i have used vc++ compiler.

# include <iostream.h>

class swidget;

class widget
{
        //int w;
        public :
                int w;
                widget()
                {
                 w = 0;
                }
                virtual void display(swidget *s)
                {
                        cout<<w;
                }
};

class swidget : public widget
{
        //int sw;
        public :
                int sw;
                swidget()
                {
                 sw = 0;
                }
                void display(swidget *s)
                {
                        cout<<sw;
                }
};

void update(swidget *s)
{
        //cout<<s->w;
        //s->w = 10;
        //cout<<s->sw;

        if(s == NULL)
                cout<<"ksjkjkjdksjdskdj";       
}

void main()
{
        //swidget *s = new swidget;
        widget *w = new widget;
        swidget *s = new swidget;
        update(dynamic_cast<swidget *>(w));
}


thanks,
greycode05.








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