struct pointer initialization

[biguo@263.net]

hello,everyone!I find some problem in following statements :
  the_block= (struct  Heap_Block *)0xdd800;
  the_block->back_flag = 1;
  the_block->front_flag = 0x22800;
  the_block->next=(struct  Heap_Block *)0;
  the_block->previous=(struct  Heap_Block *)0;
In first statement,struct pointer the_block is pointed to address 0xdd800.But the four elements of struct the_block can't be initialized.Their contents all are 0xffffffff.The above initial statements has no effect on the content of four element.It result in failure in  work space initialization.How to solve it?Thanks in advance for any help.

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