内存分配方式（动态/静态）的不同对const变量（全局/局部）访问性的影响

// CONSTANT_StaticVsDynamic.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <iostream>
using namespace std;

const int const_var2=2;  //GLOABAL const variable=>"static storage"in ROM

int _tmain(int argc, _TCHAR* argv[])
{
 const int const_var=1; // LOCAL const variable=>dynamic storage on stack.
       //what if add "static" qualifier?
 int *ptr1=const_cast<int*>(&const_var);  //  <==> (int*)&const_var;
 printf("const_var = %d\n",const_var);
 printf("*ptr1= %d\n",*ptr1);
 *ptr1=3;  // However, if "static"=> static storage =>runtime error
 printf("now *ptr1= %d\n",*ptr1); //can change value via ptr after const_cast
// const_var=1;  //compile error
 int *ptr2=const_cast<int*>(&const_var2);  //  <==> (int*)&const_var2;
 printf("const_var2 = %d\n",const_var2);
 printf("*ptr2= %d\n",*ptr2);
 *ptr2=4;  //runtime access error ocurres!!
 printf("now *ptr2= %d\n",*ptr2);
 while(1);
 return 0;
}