You probably should have started a new thread with your question rather than tacking on to the end of a nearly year-old one.
One problem with your code is that your switch A is read only once before the while loop starts. It is never read again, so there is no way to detect the change. You will need to move that into the loop.
It sounds like you want to monitor either a true to false, or false to true change and do something at that moment. You should store the value of the switch in a shift register and compare its value in the current iteration with the previous iteration. With the correct boolean logic, you can detect either the true to false or false to true change. (Not previous AND current would give a true on the false to true change.)
