c++ - Boolean_conversions Using reinterpret_cast<> -

can 1 give example

 boolean_conversions using  reinterpret_cast<> 

iam getting execution failure..any 1 explain ..

ex:

   void boolean_conversions()      {          bool b = 0;          int *i = reinterpret_cast<int*> (&b);   // iam expecting *i 0/false    ,but showing runtime error                } 

edit: in iso standard section $5.2.10, para 1:

      "the result of expression reinterpret_cast<t>(v)   result of converting expression v type t. if t   reference type, result lvalue; otherwise, re   sult rvalue , l-value r-value (4.1), array   pointer (4.2), , function pointer (4.3) standard c   onversions performed on the expression v. types sh   not defined in reinterpret_cast." 

from iam trying ..i did many conversions ..like array_to_pointer,function_to_pointer,integral/pointer_conversions ,etc...but don't know why failing boolean conversions.

can 1 tell why failing ..otherwise tell boolean conversions using reinterpret_cast.

mostly giving run time failure in g++.cc/edg/codepad..etc compilers

please explain

no, output not defined. note conversion undefined.

on machine *i = 0xcccccc00

note lsb 00

which corresponds value of bool variable initialized 0(false). byte pattern in other 3 bytes (assuming size of int 32-bits) unspecified , depends on there in memory/endianness etc.

technically, undefined behavior because deferencing memory location (all of) did not reserve/allocate.