How does rand() work in C? - Stack Overflow
Oct 28, 2015 · Like rand(), rand_r() returns a pseudo-random integer in the range [0, RAND_MAX]. The seedp argument is a pointer to an unsigned int that is used to store state …
c++ - How does modulus and rand () work? - Stack Overflow
Oct 24, 2013 · The equivalent half-open range is [0, n), and rand() % n == rand() % (n-0) + 0. So the lesson is: don't confuse half-open ranges for closed ranges. A second lesson is that this …
rand() function in c++ - Stack Overflow
Sep 27, 2011 · The c++ rand() function gives you a number from 0 to RAND_MAX (a constant defined in <cstdlib>), which is at least 32767. (from the c++ documentation) The modulus (%) …
How to generate a random int in C? - Stack Overflow
If we use more than 53 bits, we get rounding bias. Some programmers write code like rand() / (double)RAND_MAX, but rand() might return only 31 bits, or only 15 bits in Windows. …
generate a random number between 1 and 10 in c - Stack Overflow
Jul 24, 2013 · You need to seed the random number generator, from man 3 rand. If no seed value is provided, the rand() function is automatically seeded with a value of 1. and. The srand() …
Using stdlib's rand () from multiple threads - Stack Overflow
Mar 14, 2013 · From the rand man page: The function rand() is not reentrant or thread-safe, since it uses hidden state that is modified on each call. So don't use it with threaded code. Use …
c++ - How to use <random> to replace rand ()? - Stack Overflow
Oct 4, 2015 · As bad as rand() is (and it is bad), removing it would represent a huge break with the C language. Just make sure that the badness of rand() truly is good enough for your …
c++ - Why is the use of rand() considered bad? - Stack Overflow
Oct 18, 2018 · None of the answers here explains the real reason of being rand() bad. rand() is a pseudo-random number generator (PRNG), but this doesn't mean it must be bad. Actually, …
c++ - rand() between 0 and 1 - Stack Overflow
No, because RAND_MAX is typically expanded to MAX_INT. So adding one (apparently) puts it at MIN_INT (although it should be undefined behavior as I'm told), hence the reversal of sign. To …
c++ - picking rand () number from 1-6 - Stack Overflow
Aug 8, 2013 · @GrijeshChauhan - rand()/RAND_MAX will be 0 almost all the time; both expressions have type int, and the value returned by rand() is never greater than the value of …