Using the membrane keypad develop an integer calculator to add, subtract and

multiply up to four numbers $($minimum of $16-$bit computations$).$ The results are to be

displayed on the LEDs. You will need to carefully consider how to display results that are

greater than $255$ or negative $($Hint: use an additional key to switch between the upper and

lower $8-$bits.$).$ To increase the complexity, you can include division. When performing a

division, the quotient and remainder can be displayed separately. Given that the ATmega$32$A has limited division support a reminder that division is repeated subtraction until a value of

less than zero is obtained. The calculator must support mixed operations in the one

calculation $($i$.$e$.$ use addition, subtraction and multiplication in one calculation$).$ give the c code for handle number conversion