Count problem and display

UKHeliBob:
Which part of the program updates the display with the count ?

My counter is : freeparking =2

If my sensor sense a presence it should decrease the counter by 1 and if presence is gone it should increment by 1.

There are 2 IR sensor.

Im not able to link the count with the 7segment display.

My ' freeparking++ and freeparking -- ' is not being linked to the display.

what would be the proper way to link it with the display my count?