Create a simple integer calculator using the MARIE computer.

The program should execute as follows:

$1$

$.$

$$Using the INPUT instruction wait for the user to enter a decimal number.

$2$

$.$

$$Using the INPUT instruction wait for the user to enter the operator as the ASCII

character

$+$

$,$

$-$

$$or

$*$

$.$

$3$

$.$

$$Using the INPUT instruction wait for the user to enter a second decimal number.

$4$

$.$

$$Perform the desired addition, subtraction, multiplication, or division operation.

$5$

$.$

$$Store the result in a variable in memory.

$6$

$.$

$$Display the result via the OUTPUT instruction.

$7$

$.$

$$If an invalid operation is requested, display a zero as the result.

$8$

$.$

$$The code should be clearly commented.

The multiply can be done by repeated additions. For example,

$1$

$2$

$*$

$3$

$$would be

calculated as

$1$

$2$

$+$

$1$

$2$

$+$

$1$

$2$

$.$

$$You need to support a negative multiplier and negative multiplicand

$($

$1$

$2$

$*$

$-$

$3$

$)$

$.$

Implement divide by allowing the user to enter

$/$

$.$

$$Only positive numbers need to be supported. Both the resulting quotient and remainder need to be displayed. The divide can be done by repeated subtractions.