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===Random-number generators===
Random numbers are a necessary basic ingredient in the simulation of almost all discrete systems.Most computer languages have a subroutine ,object, or function that will generate a random number.Similarly ,simulation languages generate random numbers that are used to generate evnt times and other random variables
The simulation needs to generate [[random variables]] of various kinds, depending on the system model. This is accomplished by one or more [[Pseudorandom number generator]]s. The use of pseudo-random numbers as opposed to true random numbers is a benefit should a simulation need a rerun with exactly the same behavior.
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