void func()
{
    int x = 50;
   {
         int y;
         y = x + 400;
         printf("x = %d\n",x);
         printf("y = %d\n",y);
   }
}

/* global variable */
int a;

void func()
{
  /* local variable */
  int b;
  /* variables a,b are visible here */

  {
    int c;
    /* variables a,b,c visible here */

    {
      int d;
      /* variables a,b,c,d visible here */
    }

    {
      int e;
       /* variables a,b,c,e visible here */
    }
  }

  {
    int f;

    /* variables a,b,f visible here */
    {
      int g;
      /* variables a,b,f,g visible here */
    }

    {
      int g;
      /* variables a,b,f,g visible here.
       * Note that the value of the PREVIOUS g is not preserved!  Treat this
       * like a totally seperate variable. */
    }
  }
}