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How to use the rand function to make numbers in a specific range? In your case that is 3640 * 18 = 65520 Use this as a high range filter on the numbers returned by rand() as follows: do forever { r = rand() if r <= 65520 then { r = (r % (High - Low + 1)) + Low break } } Now the random numbers you generate should have the same distribution characteristics as rand()
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 OpenSSL's RAND_bytes() seeds itself, perhaps by reading dev urandom in Linux
Differences between numpy. random. rand vs numpy. random. randn in Python . . . np random rand is for Uniform distribution (in the half-open interval [0 0, 1 0)) np random randn is for Standard Normal (aka Gaussian) distribution (mean 0 and variance 1) You can visually explore the differences between these two very easily:
How does rand() work? Does it have certain tendencies? Is there . . . Now, if you are interested on the reasons why the above is true, here are the gory details on how rand() works: rand() is what's called a "linear congruential generator " This means that it employs an equation of the form: x n+1 = (*a****x n + ***b*) mod m where x n is the n th random number, and a and b are some predetermined integers
How do I get a specific range of numbers from rand ()? Related: How to generate a random int in C? Here is my answer there, which contains the definition for my int utils_rand(int min, int max) func, which returns a random number using rand() which is in the specific range from min to max, inclusive, thereby also answering this question
php - Difference between mt_rand() and rand() - Stack Overflow There's also an issue with rand relativily quickly showing patterns in its random numbers as demonstrated here A problem mt_rand seems to solve a lot better, too mt_rand uses a better randomization algorithm (Mersenne Twist), which requires more random numbers to be known before the seed can be determined and is faster
c - Is it acceptable to use rand() for cryptographically insecure . . . The “whole point” of rand() is indeed to get pseudo-random numbers, but it is notorious for having bad implementations and should not be recommended without caution Even if the OP does not need cryptographic security, their needs might still be more than a bad rand implementation provides Per the C 2018 standard, “There are no