Decimals to improper fractions program?

[Oddballs]

Hey!

I am trying to program my HP35s and Free42 to take a decimal number and convert it to improper fractions...

Example:

6.666667 in the first stack gives me 20/3 or
20
3
as output.

But i havent found any program on this forum that does this... Does anyone have a program that i could look at?

Thanks!

(Pardon my lacking english skills)