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In Files

  • prime.rb

Prime::Generator23

Generates all integers which are greater than 2 and are not divisible by either 2 or 3.

This is a pseudo-prime generator, suitable on checking primality of an integer by brute force method.

Public Class Methods

new() click to toggle source 
 
               # File prime.rb, line 349
def initialize
  @prime = 1
  @step = nil
  super
end

Public Instance Methods

next() click to toggle source
Alias for: succ
rewind() click to toggle source 
 
               # File prime.rb, line 369
def rewind
  initialize
end
succ() click to toggle source 
 
               # File prime.rb, line 355
def succ
  if (@step)
    @prime += @step
    @step = 6 - @step
  else
    case @prime
    when 1; @prime = 2
    when 2; @prime = 3
    when 3; @prime = 5; @step = 2
    end
  end
  @prime
end
Also aliased as: next