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There are a few open-source projects online that show how to optimize excessively but at the cost of an unmaintanable code for newcomers to their teams and sheer complexity for the more accustomed developers.
We could also put the set in a macro or use even more static allocation.
H int main int c, n; printf Ten random numbers in 1,100n for (c 1; c 10; c) n rand 100 1; printf dn n return 0; If you rerun this program you will get same set of numbers.C99 if (randomString) for (int n 0;n length;n) int key rand (int) (sizeof(charset) -1 randomStringn charsetkey; randomStringlength '0 return randomString; Mine (only slight optimizations char *mkrndstr(size_t length) / const size_t length, supra static char charset.-?!I hope this helps and if it's not a real-time system, then don't do much hassle with the optimizations, stability and reliability (like rand should go first.The nth random integer between 0 (inclusive) and M (exclusive) would be r M after the nth iteration.H printf int urandom_fd -2; void urandom_init urandom_fd open dev/urandom O_rdonly if (urandom_fd -1) int errsv urandom_fd; printf Error opening /dev/urandom: in errsv exit(1 unsigned long urandom unsigned long buf_impl; unsigned long *buf buf_impl; if (urandom_fd -2) urandom_init Read 4 bytes, or 32 bits into.Wrapper function for urandom, rand, or arc4random calls: #define rand_impl urandom(see large code block) rand arc4random int myRandom(int bottom, int top) return (rand_impl (top - bottom) bottom;.The difference is here really thin as on a few repetitions gprof gives random data, so let's take callgrind instead.Arc4random_addrandom is used by arc4random_stir to populate it's internal random number pool according to the data passed.
I had to implement a very similar function for a project of mine.
If you evaluate a b where a and b are integers then result will always be less than b for any set of values of a and.
It's useless for anything serious.Last thing I'd like to point you at is that error: for loop initial declarations are only allowed in C99 mode).If you do not have these functions, but you are on Unix, then you can use this code: This is C, not C #include sys/types.Here, mkrndstr_ipa, d means: in-place for automatically stored and dynamically stored data (different calls, identical functions respectively.The total cost is then more precisely calculated in function calls: 7,986,402,268?:randstring perf/t/mkrndstr-notmine 6,655,222,307?:mkrndstr perf/t/mkrndstr-notmine 6,653,436,779?:mkrndstr_ipa perf/t/mkrndstr-notmine 6,653,436,778?:mkrndstr_ipd perf/t/mkrndstr-notmine.Notes: butterfly games full version A read from /dev/urandom will NOT block if there is insufficient entropy available, so values generated under such circumstances may be cryptographically insecure.I guess you know libc's rand is an implementation of a prng.What you are referring to may be psychological, like seeing a run of heads when tossing a coin and believing there to be a bias where there is none, but of course this evens out in the long run.You could also simply read chunks from /dev/urandom (with the u prefix, otherwise my "simply" wouldn't hold) or similar on a unix derivative.H exit #include stdio.