C/C++ changing the value of a const

Question

I had an article, but I lost it. It showed and described a couple of C/C++ tricks that people should be careful. One of them interested me but now that I am trying to repli

Answer 1

Some of these answers point out that the compiler can optimize away the variable 'a' since it is declared const. If you really want to be able to change the value of a then you need to mark it as volatile

  const volatile int a = 3; // I promise i won't change a
  int *ptr = (int *)&a;
  (*ptr) = 5; // I'm a liar, a is now 5

Of course, declaring something as const volatile should really illustrate just how silly this is.