Ruby/Number/Prime Numbers
Материал из Wiki.crossplatform.ru
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ViGOur (Обсуждение | вклад) м (1 версия: Импорт выборки материалов по Ruby) |
Текущая версия на 17:59, 13 сентября 2010
Содержание |
Generates 25 prime numbers from 2 to 97
require "mathn" list_primes = Prime.new puts list_primes.each { |prime| print prime, " "; break unless prime < 90 }
Generating Prime Numbers with succ
require "mathn" primes = Prime.new primes.succ # => 2 primes.succ # => 3
Pass code block into each
require "mathn" primes = Prime.new primes.each { |x| puts x; break if x > 15; } # 5 # 7 # 11 # 13 # 17 primes.succ # => 19
Prime Numbers
require "mathn" prime_number = Prime.new # instantiate a Prime object prime_number.next # => 2 # return the next prime number (seed = 1) prime_number.succ # => 3 # succ works, too # print the next prime number as a string puts "The next prime number is " + prime_number.next.to_s + "."
Use each method from Prime class
#!/usr/bin/env ruby require "mathn" list_primes = Prime.new list_primes.each { |prime| print prime, " "; break unless prime < 90 }
Use Prime to generate prime numbers
#!/usr/bin/env ruby require "mathn" prime_number = Prime.new # instantiate a Prime object prime_number.next # => 2 # return the next prime number (seed = 1) prime_number.succ # => succ works, too # print the next prime number as a string puts "The next prime number is " + prime_number.next.to_s + "." # => The next prime number is 5.
