如果能用each_with_index代替each，代码就简单了：
(11..26).to_a.each_with_index do |n, i|
print '%4d'%n
puts if (i+1)%4==0
end
Ruby
如果能用each_with_index代替each，代码就简单了：
(11..26).to_a.each_with_index do |n, i|
print '%4d'%n
puts if (i+1)%4==0
end