malloc ( 100 ) --> 0xbb901080 num: 1
 0xbbbe2bc3
 0xbbbe33bd
 0x8048757
 0x80485b4
 0x8048517
realloc ( NULL , 10 ) --> 0xbb907040 num: 2
 0xbbbe2bc3
 0xbbbe3498
 0x8048788
 0x80485b4
 0x8048517
realloc ( NULL , 40 ) --> 0xbb908040 num: 3
 0xbbbe2bc3
 0xbbbe3498
 0x8048788
 0x80485b4
 0x8048517
realloc ( NULL , 70 ) --> 0xbb909060 num: 4
 0xbbbe2bc3
 0xbbbe3498
 0x8048788
 0x80485b4
 0x8048517
free ( 0xbb901080 ) num: 5
 0xbbbe2bc3
 0xbbbe3546
 0x80487a2
 0x80485b4
 0x8048517
free ( 0xbb909060 ) num: 6
 0xbbbe2bc3
 0xbbbe3546
 0x80487b0
 0x80485b4
 0x8048517
