Getting the same value of the const variable even after changing it through const_cast

Question

Consider the below code snippet:

int main()
{
    const int i=3;
    int *ptr;

    ptr=const_cast(&i);
    *ptr=5;

    cout<<\"i= \"<&         


        

Answer 1

I hade same problem, I added volatile, now it's modifying:

#include
using namespace std;

int main()
{
  volatile const int a=5;
  int *p = const_cast(&a);
  *p=6;
  cout<<"a="<

Output:

a=6

volatile tells compiler that the identifier can be modified (if not by this code then by some one else, so do not perform any optimization)