ruby位数自动补齐
case:1
max = 0
b=["1","3","100","1000"]
b.each{|key|
len = key.to_s.length
(len>max)?(max=len):()
}
b.each{|key|
puts "0"*(max - key.to_s.length)+key.to_s
}
case:2
15.times do |i|
puts sprintf("%02d\n",i)
end
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