Question

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Create a MARIE assembly program which inputs two integers, X and Y, computes 3X + 4Y, and outputs the result. Requirements 1. The program must be written in MARIE Assembly Language. 2. It must use a subroutine to perform the multiplications. 3. You do not need to prompt for the input, just use the Input instruction. The user will need to know to enter X first and then Y 4. Similarly no text is required with the output, just use the Output instruction Hints 1. 2. 3. Lesson 4 has information on downloading the MARIE simulator. Activity 4 will introduce you to MARIE. Example 4.5 in the textbook has an example of using a subroutine. It has one Parameter. You will need two for the multiply routine. Do that by adding another labelled memory location before the Subroutine label 4. The subroutine will need to use a loop to perform the multiply. There is an example of a loop in Example 4.4. Upload: Your MARIE assembly file (.mas)

Answer 1

Hi, Please check the code below and the snapshots of the output to understand the solution better. Comments are inserted as and where necessary.

Code:

/ Multiplication Using Subroutines
/ Prompt user to type in integers
INPUT
Store X/Get the Value of X
INPUT
Store Y/Get the Value of Y
JnS MultiplyExpression/Call the subroutine to calculate the multiplication
Load resX/Load the final result stored in resX
Output/Output the result
Halt

X, DEC 0/Initial Value of X
Y, DEC 0/Initial Value of Y
resX, DEC 0/Initial Value of resX
resY, DEC 0/Initial Value of resY
one, DEC 1/Variable to use to decrement the counter
countX, DEC 3/Since the expression is 3X
countY, DEC 4/Since the expression is 4Y

/Start the subroutine MultiplyExpression
MultiplyExpression, HEX 000 / Used for storing return address
/ Loop for performing iterative addition of X
loopX, Load resX
Add X/Perform Multiplication though repetitive addition
Store resX

Load countX
Subt one/Decrement the counter by 1
Store countX

Skipcond 400 / have we completed the multiplication?
Jump loopX / no; repeat loop
/ yes, so exit the loop

loopY, Load resY
Add Y
Store resY

Load countY
Subt one
Store countY

Skipcond 400 / have we completed the multiplication?
Jump loopY / no; repeat loop
/ yes, so exit the loop

/Calculate the addition of products 3X and 4Y
Load resX
Add resY/Add the result of Y to X
Store resX/Stores the final result of 3X + 4Y
/ Exit subroutine MultiplyExpression
JumpI MultiplyExpression

Output:

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