Ruby - 质数计算器

Question

我需要一些反馈来弄清楚为什么我不能通过我的方法在屏幕上puts 或print 任何东西。这是我为解决寻找第 1001 个素数的问题而编写的一个简单脚本。谢谢

def primes
  # iterates through numbers until it has the 1001th prime number and returns it.
  # I chose to create the num_primes variable instead of counting the number of 
  # elements in in_prime_array every iteration
  # based upon a guess that it would be faster to check.

is_prime_array = []
  num_primes = 0
  i = 2
  loop do
    is_prime_array << i && num_primes += 1 if is_prime?(i) == true 
    i += 1
    break if num_primes == 1001
    end
  is_prime_array[1001]
end


def is_prime? (num)
# Checks to see if the individual number given is a prime number or not.
i = 2
  loop do
    if i == num
      return true
    elsif num % i == 0
      return false
    else
      i += 1
    end
  end
end

感谢您的帮助!

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编辑

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我采纳了您的建议并尝试了这段代码:

def is_prime? (num)
  # Checks to see if the individual number given is a prime number or not.
  i = 2
  loop do
    if i == num
      return true
    elsif num % i == 0
      return false
    else
      i += 1
    end
  end
end

i = 0
count = 0
loop do
  count += 1 if is_prime?(x)
  puts "#{i}" if count == 1001
  break
end

它仍然没有返回任何内容。哼哼

Answer 1

i = 0
count = 0
loop do
  if is_prime(i)
    count += 1
  end

  if count == 10001
    puts "#{i}"
    break
  end
end

简单的方法:)