#include <iostream>
 
const int a = 5;

int main(int argc, char *argv[])
{
    std::cout << "Hello!" << std::endl;
    int *b;
    b = const_cast<int *>(&a);
    *b = 4;
    std::cout << &a << " " << b << std::endl;
    std::cout << a << " " << *b << std::endl;
}

Hello!

Segmentation fault