hacking-the-art-of-exploitation

815015288
1315541117
2080969327
450538726
710528035
907694519
1525415338
1843056422
random values from 1 to 20
2
3
8
5
9
1
4
20
reader@hacking:~/booksrc $ ./a.out
RAND_MAX is 2147483647
random values from 0 to RAND_MAX
678789658
577505284
1472754734
2134715072
1227404380
1746681907
341911720
93522744
random values from 1 to 20
6
16
12
19
8
19
2
1
reader@hacking:~/booksrc $
The program’s output just displays random numbers. Pseudo-randomness
can also be used for more complex programs, as you will see in this section’s
final script.
0x287
A Game of Chance
The final program in this section is a set of games of chance that use many
of the concepts we’ve discussed. The program uses pseudo-random number
generator functions to provide the element of chance. It has three different
game functions, which are called using a single global function pointer, and
it uses structs to hold data for the player, which is saved in a file. Multi-user file
permissions and user IDs allow multiple users to play and maintain their own
account data. The game_of_chance.c program code is heavily documented,
and you should be able to understand it at this point.
102 0x200