random number generator no repeats

Random number, C language function is rand (), C + + is a random number generator (Random-number generator) = Distribution object (distribut

1. Question Given a random number generator, this generator can generate a random number ranging from 1 to 5 () evenly. How can we use this generator to generate a

Method One: Generate two (1,5) random number, this is a total of 25 cases, note that the two numbers are in order, from the 25 cases, take the first 21, each three kinds of representative (1,7) A number, if you take the case of the 21, discard the re-fetch.Method Two: Generate three (1,5) random numbers, representing a

Random Number, random number generator Math. random () generates a random number of the double type in the range of [0, 1. Thread security:

://www.inbreak.net/archives/349Q: Theoretically, the random number generated by the computer is pseudo-random number, so how to produce high-intensity random number?A: There are two important factors for generating high-intensity

random number generator in Java: Random,threadlocalrandom,securerandomIn the articleThe Random is: Java.util.Random,Threadlocalrandom namely: Java.util.concurrent.ThreadLocalRandomSecureRandom namely: Java.security.SecureRandomis Q:random thread-safe?A:random is thread-safe,

/*Version: 1.0Author: hellogiserBlog: http://www.cnblogs.com/hellogiserDate: 2014/6/3*/// Use rand5 to generate rand7Int Rand7 (){Int x;Do{X = Rand5 () * 5 + Rand5 ();}While (x> = 21 );Return x % 7;} (4) rand7 generate rand10 C ++ Code 1234567891011121314151617 /*Version: 1.0Author: hellogiserBlog: http://www.cnblogs.com/hellogiserDate: 2014/6/3*/// Use rand7 to generate rand10Int Rand10 (){Int x;Do{X = Rand7 () * 7 + Rand7 ();}While (x> = 40 );Return x % 10;} (

RandomThe random class in Java generates a pseudo-random number, uses the seed of 48-bit, and then calls a linear congruential formula linear congruence equation (Donald Knuth's programming Art of 3.2.1)If two random instances use the same seed, and the same function is called, then the generated sequence is the sameYo

SecureRandom java.securityClass SecureRandom Java.lang.Object java.util.Random java.security.SecureRandom all implemented interfaces:Serializable SecureRandom Extends Random This class provides a cryptographically strong random number generator (RNG). Many implementations are pseudo

The number of on-demand computers has important applications in many fields, such as Monte Carlo simulation, cryptography, and network security. The random number quality is directly related to the reliability and security of the network security system, and to the reliability of the Monte Carlo simulation results. Since the birth of the computer, it has been a l

Introduction to linear homogeneous random number generator: The old LCG (linear congruential generator) represents the best and simplest pseudo-random number generator algorithm. The m

We often need to randomly generate a group of non-repeated questions when performing an exam system that can automatically generate the exam. net Framework provides a class System dedicated to generating random numbers. random. As we all know about random numbers, computers cannot generate completely random numbers. Th

In the previous blog, we learned about the real random number generator based on physical phenomena, however, the real random number generation is slow, for the actual computation needs, the random

RNG Random number generatorRNG g_rng (12345);/******************************************************************************************************/The friends who make the algorithm with OpenCV must worry about the random number, the new version has always supported the random