accidentally pressing the f or g button

[Adnan]

With the original 15-C, when you accidentally pressed the yellow f or
the blue g button, you could press that button again to disable the
button.

Why isn't this possible with the 15-C for iPhone? Is this a bug?

[Thomas Fors]

Hi Adnan,

I've tried to emulate the original HP calculators as closely as possible. I've tested this on my authentic 15C and it does not toggle the prefix keys on and off with each keypress.  According to the original HP manual, the way to clear the f and g prefix is to press f Clear Prefix (above the backspace key). 

If enough people would like the f and g keys to toggle the prefix on an off though, I may consider making it a preference option.

Thanks for the feedback.

--Tom