In this assignment you will be asked to create your own functions and use a global variable. Normally, a global

variable isn't necessarily the best option, but it will work for this assignment.

Assignment

For this assignment, you will create a simple counter based on button clicks. If you click on the left button, you

will add one to a variable. If you press the right button, you will subtract one from the same variable.

Each time you press the button, you must print the new value to the LCD. $($Clear it after every click before

printing the next number.$)$

This program does not need a proper exit from main.

See the video below for additional clarification.

Required Functions

You will need one function for add and one function for subtract.

Both functions must return void.

Here are the function prototypes:

void add$($void$)$;

void subtract$($void$)$;