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

Is it any compiler optimization mechanism that compiler replaces the variable in the program with the value?

Yes; that will be why you don't see the value changing. The behaviour of trying to modify a const object is left undefined in order to allow optimisations like that (as well as allowing the objects to be placed in unwritable memory).