In that snippet of code, the order would be A, D, E, A, D, E,.... The variable in the switch statement has the value 0 so the default case code would be executed.
If you increment variable, then the order would be A, B, E, A, B, E,...
Increment again to get A, C, E, A, C, E,...
Increment again to once again get A, D, E, A, D, E,...