first_name = gets.chomp

first_name.capitalize!

first_name.upcase!

first_name.downcase!

print <<EOF  # 多行輸出EOF

# 我是注釋

#{first_name}

if a < b  puts '1'elsif b < a  puts '2'end    

class Classname  def functionname(params)    puts params  endendclass1 = Classname.newclass1.functionname('1')unlessunless false  print 'ok'else  print 'no'end    

print 'puts'user_input = gets.chompuser_input.downcase!if user_input.include?"s"  print 'has s'end

# s -> thuser_input.gsub!(/s/,"th")

puts 'okok #{user_input}'

counter = 1while counter < 11  puts counter  counter = counter + 1end

counter = 1until counter > 10  print counter  counter = counter + 1end  

for num in 1...10  puts numend  

i = 20loop do  i -= 1  print "#{ i }"  break if i <= 0end  

i = 20loop do i -= 1 next if i%2 != 0 print "#{i}" break if i <= 0end

my_array = [1,2,3,4,5]

numbers = [1, 2, 3, 4, 5]# one way to loopnumbers.each { |item| puts item }# another way to loopnumbers.each do |item| puts itemend

10.times { print 'ok'})

num = 1while num <= 50 do  print num  num += 1end  

num = 1until num > 50 do  print num  num += 1end  

num = 0loop do  num += 1  print "Ruby!"  break if num == 30end  

text.split(",")puts "Text to search through: "text = gets.chompputs "Word to redact"redact = gets.chompwords = text.split(" ")words.each do |word|  print wordend