In Ruby, Output of puts 07 is 7. But output of puts 08 is error. Why?

Answer 1

0b1110 will output 14 bc if start with 0b following number must be binary

0xff will output 255 bc if start with 0x following number must be hex

So how about 07?
if start with 0 and 0-7
It mean start to do octal number
07 = 7
016 = 14

anyway search google my grammar bad!

Answer 2

https://stackoverflow.com/questions/11177320/invalid-octal-digit-error