array = (1..10).to_a
# 方法1
length = array.length  
length.times do |t|  
 print "#{array[t]} "  
end  
puts "\n"

# 方法2
length = array.length-1  
for i in 0..length do  
  print "#{array[i]} "  
end
puts "\n"

# 方法3
for i in array do  
  print "#{i} "  
end 
puts "\n"

# 方法4
array.each{|x| print x," "}
puts "\n"

# 方法5
length = array.length  
i = 0  
while i< length do  
  print "#{array[i]} "  
  i = i+1  
end 
puts "\n"

# 方法6
length = array.length  
i = 0  
until i==length do  
  print "#{array[i]} "  
  i += 1  
end  
puts "\n"

# 方法7
array.each_index do |i|  
    print "#{array[i]} "  
end  
puts "\n"

# 方法8
length = array.length - 1  
0.upto(length) do |i|
  print "#{array[i]} "  
end
puts "\n"

# 方法9
length = array.length - 1  
i = 0  
loop do  
  print "#{array[i]} "  
  i += 1  
  break if i > length #也可以用break unless i <= length   
end