Write a C / C++ program to modify the constant variable ?

Problem#4

/*Note : This is a Bug Code ,, in actual it is NOT POSSIBLE !! , this code will only work On MS Visual 2008 & 2010*/

//Sol#1

#include<stdio.h>
int main(){
    int i=10;
    int *ptr=&i;
    *ptr=(int *)20;
    printf("%d",i);
    return 0;
}

//Sol#2

#include <iostream.h>
int main(){
    const int f=11;
  int *ptr = const_cast<int*> (&f);
	int t;
	cout<<"Change Value Of F to :=:"; cin>>t;
	*ptr = t
	cout<<f;
	return 0;
}