Also, a library where you have to pay to go to the bathroom! I have no cash... :-(
Hmm... I never was in a library with bathrooms. And I wasn't in any library for uhm... at least 10 years.
That being said, I guess it's indeed strange that you need to pay. Often in places where you can do something else, it's locked with a code you need to go get first (sometimes not even that, though). Talking about Switzerland, that is. Public toilets need to be paid more often than not; especially in cities.
But... why don't (well, didn't) you have any cash with you? o.o