Programming

int main() {
    const int i = 10;
    *(const_cast<int*>(&i)) = 11;
    cout << i << endl;  // Ans: 10
}

main:
.LFB957:
   .cfi_startproc
   .cfi_personality 0x3,__gxx_personality_v0
   pushq %rbp
   .cfi_def_cfa_offset 16
   movq  %rsp, %rbp
   .cfi_offset 6, -16
   .cfi_def_cfa_register 6
   subq  $16, %rsp
   movl  $10, -4(%rbp)
   leaq  -4(%rbp), %rax
   movl  $11, (%rax)            # here it is 11 
   movl  $10, %esi              # but 10 is used for cout
   movl  $_ZSt4cout, %edi
   call  _ZNSolsEi
   movl  $_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_, %esi
   movq  %rax, %rdi
   call  _ZNSolsEPFRSoS_E
   movl  $0, %eax
   leave
   ret
   .cfi_endproc

int main() {
    const int i = 10;
    int *p = const_cast <int*> (&i);
    *p = 11;
    cout << *p << "  " << i << endl;  // Ans: 11  10

    *(const_cast<int*>(&i)) = 11;
    cout << i << endl;  // Ans: 10

    *(const_cast<int*>(p)) = 12;
    cout << *p << "  " << i << endl;  // Ans: 12  10
}

static int debug_if=0; // Poke this value with your debugger when you want debug into to appear

...

if(debug_if) // ...but at high optimization, it might skip this anyway!
{
        fprintf("debug dump follows: ...\n");
        ...
}