Number System Interconversion

Question

Can all the values in decimal be finitely represented in binary, hexadecimal and octal system and vice versa?
I know 0.2 cannot be converted to the binary form which has a finite representation. Any other such number which cannot be converted from one of the number systems to other?

Comments

I think every fixed length hexadecimal/octal/binary fractional numbers have fixed length decimal representation but  every fixed length/recurring decimal fractional numbers can't be written in fixed length binary...

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0.7 needs infinite precision to represent in binary but as we know we have only fixed the amount of memory on the computer. It can be represented but with the loss of precision.

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Check this link out: The selected answer gives a very good explanation on why certain numbers can't be represented exactly in  some bases.

https://stackoverflow.com/questions/1089018/why-cant-decimal-numbers-be-represented-exactly-in-binary