Does Ruby Have a Random Number Generator Class?
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Possible Duplicate:
How to get a random number in Ruby?
我只是古玩，但是露比是否有一个专门生成随机数的类，比如Java的java. UTIL随机类，或者是露比所有的RAND方法？
内核中有一个rand方法：)
API文档
1 2 3 4 5 6 7 8 | rand(max=0) => number Converts max to an integer using max1 = max.to_i.abs. If the result is zero, returns a pseudorandom floating point number greater than or equal to 0.0 and less than 1.0. Otherwise, returns a pseudorandom integer greater than or equal to zero and less than max1. Kernel::srand may be used to ensure repeatable sequences of random numbers between different runs of the program. Ruby currently uses a modified Mersenne Twister with a period of 2**19937-1. srand 1234 #=> 0 [ rand, rand ] #=> [0.191519450163469, 0.49766366626136] [ rand(10), rand(1000) ] #=> [6, 817] srand 1234 #=> 1234 [ rand, rand ] #=> [0.191519450163469, 0.49766366626136] |
有一门"随机"课
请看如何在Ruby中获取随机数的问题。
1 2 | 10.times.map{ Random.new.rand(20..30) } #=> [26, 26, 22, 20, 30, 26, 23, 23, 25, 22] |