ahref:
It should be a documented step to enable, or like the very nice edit a checkbox. I would uncheck that box when working with tinys or unos.
Grab this file: https://github.com/krupski/arduino-1.0.3/blob/master/app/pde.jar
Backup your pde.jar file and replace it with this one. It adds a checkbox in Preferences to enable or disable floating point support (i.e. using %f).
It works with Arduino 1.0.0 to 1.0.3.