coldfusion rand

Comparison between functions rand and mt_rand in PHP. PHP functions rand and mt_randmt_rand () are four times faster than rand (). The old libc random number generator has some uncertain and unknown features and is very slow. PHP rand () functions use PHP functions rand and

The MySQL RAND () function call can produce a random number between 0 and 1: Mysql> SELECT rand (), RAND (), Rand (); +------------------+-----------------+------------------+ | RAND () | RAND () |

This paper compares and analyzes the performance problem of random function Mt_rand () and Rand () in PHP. Share to everyone for your reference. The specific analysis is as follows: The Mt_rand () and Rand () functions in PHP can randomly generate a pure number, they all need us to set up the seed data and then generate, then Mt_rand () and Rand () that the perf

Summary of methods for generating pseudo-random numbers using rand () and srand () --------------------------------- The standard library Function 1: int rand (void );Returns a random integer between [seed, RAND_MAX (0x7fff) starting from the seed specified in srand (seed. Function 2: void srand (unsigned seed );The seed parameter is the seed of rand () and us

Example 1. Mt_rand () example The code is as follows Copy Code Echo Mt_rand (). "N";Echo Mt_rand (). "N";Echo Mt_rand (5, 15);?>The output of the example above is similar to the following:160471601414786132786 Note: Since PHP 4.2.0, no longer need to use the Srand () or Mt_srand () function for the random number generator seeding, has been automatically completed. Note: In the previous version of 3.0.7, Max means range. To get a random number in these ve

Usage of RAND () functions in MySQL This article describes how to use the RAND () function in MySQL. It is the basic knowledge of getting started with MySQL. For more information, see MySQL RAND () function calls can generate a random number between 0 and 1: ? 1 2 3 4 5 6 7 Mysql> select rand (),

The random number of a computer is generated by a pseudo-random number, which is a sequence of small m-polynomial, in which each small sequence has an initial value, that is, a random seed. (Note: The period of the small m polynomial sequence is 65535, that is, the period of the random number generated by each random seed is 65535, and when you get 65,535 random numbers, they repeat.) ）We know that the rand () function can be used to generate random n

The formula is as follows: RAND () * (y-x) + x As we learn about PHP, a random function, Rand or Mt_rand, can pass in a parameter that produces a random integer between 0 and a parameter, or it can pass in two parameters, producing a random integer between the two parameters.And in MySQL, the random number function Rand cannot pass the argument, generating 0 to

I. rand () Function Name: RandFunction: Random number generatorUsage: int rand (void); The header file: stdlib.h Function Description: The internal implementation of RAND () is done with linear congruential, it is not a true random number, because its cycle is very long, so in a certain Can be seen as random in its scope. RAN