I use a block of continuous memory, divide the memory into Block(50 int).and each last one of Block is used to store the block number of previous Block in a same stack.moreover,I use two arrays to identify whether the Block is free and  to store offset in a Block respectively.Finally, I use an array[1000] to store the number of Block are being used in a stack.

Edited by author 16.05.2014 13:38