Hello,

I don't use this type of calculator so I'm guessing only: I assume that you've changed the settings of your calculator by accident:

(A) There are countries (Germany for instance) where the comma is the separator between integer part and fraction part of a rational number. The dot is used to separate the thousands. Example:

(B) grad is a unit to measure an angle which is used by surveyors. The relation between degrees and grad is given by the following equation: