i have big problem rand()

[Athar]

Looks like your compiler is a major annoyance. I'd just disable that particular warning (if possible), but instead you can explicitly cast to the desired type:
srand((unsigned int)time(0));

Edit: too slow.

[jsmith]

srand( time( 0U ) );

does the trick without the cast.

[Zhuge]

Really? I thought the problem was because time() returns a time_t and not an unsigned int?