Lab4

Program the FPGA on the Nexys A7-100T board to function as a simple hexadecimal calculator capable of adding and subtracting four-digit hexadecimal numbers using a 16-button keypad module.

Modifications:

1. zero suppression, this makes it so there will no zeros as the first numbers on the display. This means that 0023 will appear as 23

2. Added the subtraction operation

3. Added the button (BTND) to do subtraction