Kiterminal's Blog

void binary(int number) {
  int remainder;
 
  if(number <= 1) {
    cout << number;
    return;
  }
 
  remainder = number%2;
  binary(number >> 1);
  cout << remainder;
}

>> 7403.to_s(2)
=> “1110011101011″

> ('1'..'10').to_a
=> ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10"]
> ('2'..'10').to_a
=> []
> ('3'..'10').to_a
=> []
> ('2'..'20').to_a
=> ["2", "3", "4", "5", "6", "7", "8", "9", . . . . ., "18", "19", "20"]
> ('3'..'20').to_a
=> []
> ('10'..'20').to_a
=> ["10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20"]
> (1..10).to_a
=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
> (2..10).to_a
=> [2, 3, 4, 5, 6, 7, 8, 9, 10]
> (3..10).to_a
=> [3, 4, 5, 6, 7, 8, 9, 10]

> (’2′..’10′).to_a
=> []

> require 'date'
> date = Date.strptime('24-07-2007', '%d-%m-%Y')
> date.mday # => 24
> date.month # => 7
> date.year # => 2007

irb(main):001:0> def generate_password(length = 6)
irb(main):002:1> chars = ('a'..'z').to_a + ('A'..'Z').to_a + ('1'..'9').to_a - ['o', 'O', 'i', 'I']
irb(main):003:1> Array.new(length) { chars[rand(chars.size)] }.join
irb(main):004:1> end
=> nil

irb(main):005:0> pass = generate_password
=> "khbNP9"

irb(main):006:0> pass = generate_password(15)