Using the MARIE computer assembly language, write a program that computes the fo

Question

Using the MARIE computer assembly language, write a program that computes the following expression:z <-- (a * b) * (c * d). The computer will read in the input values a, b, c, and d from the keyboard, and thefinal result (z) has to be displayed. In addition, every time an input value is read in, it must be displayed on the screen. Each instance of multiplication should be carried out via your own multiplication subroutine. Remember that the instruction set does not have an instruction to execute multiplication, you must write one. The program must be tested in the MARIE simulator.

Explanation / Answer

First let me give you the program:

ORG 100

Load A

Store W

Load B

Store X

JnS Mul

Load Sum

Store Re1

Load C

Store W

Load D

Store X

JnS Mul

Load Sum

Store Re2

Load Re1

JnS Mul

Load Sum

Store FRe

Halt

A, Dec ?

B, Dec ?

C, Dec ?

D, Dec ?

W, Dec 0

X, Dec 0

Ctr, Dec 0

One, Dec 1

Re1, Dec 0

Re2, Dec 0

FRe, Dec 0

Sum, Dec 0

Mul, Dec 0

Load X

Store Ctr

Clear  

Store Sum

Loop, Load Sum

Add W

Store Sum

Now let me give you the Explaination:

First I loaded the parameter A and then store it in the variable named 'W'

Load A

Store W

Then

I loaded the parameter B and then store it in the variable named 'X'

Load B

Store X

Then I jumped to multiplication subroutine

Then I got the result

Then I stored it in temporary storage variable 'Re1'

Then I jumped to multiplication subroutine

Then I got the result

Then I stored it in temporary storage variable 'Re2'

Now I loaded the first result

Then I jumped to multiplication subroutine

Then I got the result

Then I stored it in temporary storage variable 'FRe'

Then Halt, which is termination of the program

Halt

Then I asked for parameters A,B,C,D

A, Dec ?

B, Dec ?

C, Dec ?

D, Dec ?

Then parameters W and X are declared

W, Dec 0

X, Dec 0

Counter for looping Ctr and a constant variable with value 1 is created

Ctr, Dec 0

One, Dec 1

Temporary storage variables 'Re1', 'Re2', 'FRe' are declared

Re1, Dec 0

Re2, Dec 0

FRe, Dec 0

Declared Sum

Sum, Dec 0

the below line stores return address

Mul, Dec 0

To load the second parameter to use as counter I did the following

Load X

To store counter

Store Ctr

To clear sum

Clear  

To rewrite the value in Sum to 0 to start again I did as below

Store Sum

To load Sum

Loop, Load Sum

To add First parameter

Add W

To store result in Sum

Store Sum

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