The third menu option has not been implemented. To implement $$Option $3,$ edit

the file ex$04$a$.$ino, and modify the existing function DoStuffForOption$3()$ as

follows $($Note: All of the code you write for this exercise will be within this

function$)$:

a$.$ Create a variable named speed of type double to represent the speed in

km$/$h$.$

b$.$ Create a variable named distance of type double to represent the

distance in km and set the value to zero.

c$.$ Create a variable named deltat of type double to represent the time

elapsed between calls in hours.

d$.$ Implement a looping mechanism that loops as long as neither sw#$1$ or

sw#$2$ is pressed. Note: Variables named swPin$1,$ swPin$2,$ swPin$3,$ and

swPin$4$ have already been declared, populated, and setup with a mode

of INPUT$\_$PULLUP $($see Exercise #$3$ for more detail regarding how this

was accomplished$).$ You must use the values stored in these four

variables when implementing the looping criteria for the loop you

implement.