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###### 日期：2020-07-30 11:07

Program #4

Due Sunday by 11:59pm Points 50 Submitting a file upload File Types asm

Available after Jul 19 at 12am

Submit Assignment

Due: Week 6, Sunday, 11:59 PM Pacic

USA Time Zone

Objectives

1. Using indirect addressing

2. Passing parameters on the stack

3. Generating “random” numbers

4. Working with arrays

Description

Write a MASM program to perform the tasks shown below. Be sure to test your program and ensure

that it rejects incorrect input values.

1. Introduce the program.

2. Get a user request in the range [min = 15 .. max = 200].

3. Generate request random integers in the range [lo = 100 .. hi = 999], storing them in consecutive

elements of an array.

4. Display the list of integers before sorting, 10 numbers per line.

5. Sort the list in descending order (i.e., largest first).

6. Calculate and display the median value, rounded to the nearest integer.

7. Display the sorted list, 10 numbers per line.

Example Program Operation

Sorting Random Integers

Programmed by Author Name

This program generates random numbers in the range [100 .. 999],

displays the original list, sorts the list, and calculates the

median value. Finally, it displays the list sorted in descending order.

How many numbers should be generated? [15 .. 200]: 10

Invalid input

How many numbers should be generated? [15 .. 200]: 16

The unsorted random numbers:

680 329 279 846 123 101 427 913 255 736

431 545 984 391 626 803

The median is 488.

The sorted list:

984 913 846 803 736 680 626 545 431 427

391 329 279 255 123 101

Thanks for using my program!

2020/7/28 Program #4

https://canvas.oregonstate.edu/courses/1776058/assignments/7977476 2/7

Requirements

1. The title, programmer's name, and brief instructions must be displayed on the screen.

2. The program must validate the user’s request.

3. The main procedure must consist (mostly) of procedure calls. It should be a readable “list” of

what the program will do.

4. min, max, lo, and hi must be declared and used as global constants.

5. All procedure parameters must be passed on the system stack.

6. Each procedure will implement a section of the program logic, i.e., each procedure will specify

how the logic of its section is implemented. The program must be modularized into at least the

following procedures and sub-procedures:

main

introduction

get data {parameters: request (reference)}

fill array {parameters: request (value), array (reference)}

sort list {parameters: array (reference), request (value)}

exchange elements (for most sorting algorithms): {parameters: array[i] (reference), array[j]

(reference), where i and j are the indexes of elements to be exchanged}

display median {parameters: array (reference), request (value)}

display list {parameters: array (reference), request (value), title (reference)}

7. Parameters must be passed by value or by reference on the system stack as listed above.

8. There must be just one procedure to display the list. This procedure must be called twice: once to

display the unsorted list, and once to display the sorted list.

9. Procedures (except main) should not reference .data segment variables by name. request, array,

and titles for the sorted/unsorted lists should be declared in the .data segment, but procedures

must use them as parameters. Procedures are allowed to use local variables when appropriate

(section 8.2.9 in the textbook). Global constants are OK.

10. The program must use appropriate addressing modes for array elements.

11. The two lists must be identified when they are displayed (use the title parameter for the display

procedure).

12. Each procedure must have a procedure header that follows the format discussed during lecture.

13. The code and the output must be well-formatted.

14. The usual requirements regarding documentation, readability, user-friendliness, etc., apply.

Notes

1. DO NOT put this off - it is a much more time-intensive project than any of Programs #1 - #3.

2. The Irvine library provides procedures for generating random numbers. Call Randomize once at

the beginning of the program (to set up so you don't get the same sequence every time), and call

RandomRange to get a pseudo-random number. (See the documentation in Lecture slides.)

3. The Selection Sort is probably the easiest sorting algorithm to implement. Here is a version of the

descending order algorithm, where request is the number of array elements being sorted, and

exchange is the code to exchange two elements of an array:

2020/7/28 Program #4

https://canvas.oregonstate.edu/courses/1776058/assignments/7977476 3/7

Program 4 Rubric

for (k=0; k<request-1; k++) {

i = k;

for (j=k+1; j<request; j++) {

if (array[j] > array[i])

i = j;

}

exchange(array[k], array[i]);

}

4. The median is calculated after the array is sorted. It is the "middle" element of the sorted list. If

the number of elements is even, the median is the average of the middle two elements (may be

rounded).

5. If you choose to use the LOCAL directive while working on this program be sure to read section

8.2.9 in the Irvine textbook. LOCAL variables will affect the contents of the system stack!

Extra Credit Options

(1 pt) Display the numbers ordered by column instead of by row.

(3 pts) Implement the sorting functionality using a recursive Merge Sort algorithm. For a graphical

explanation of the algorithm, I recommend this GeeksForGeeks article

(https://www.geeksforgeeks.org/merge-sort/) . You may add additional procedures to your program

as needed. Remember that all parameters must be passed on the system stack.

In order to ensure you receive credit for any extra credit work, you must add one print statement to

your program output PER EXTRA CREDIT which describes the extra credit you chose to work on.

You will not receive extra credit points unless you do this. The statement must be formatted as

follows...

--Program Intro--

**EC: DESCRIPTION

--Program prompts, etc--

Please refer back to the documentation for Program 1 to see a sample of the extra credit format.

2020/7/28 Program #4

https://canvas.oregonstate.edu/courses/1776058/assignments/7977476 4/7

Criteria Ratings Pts

1.0 pts

1.0 pts

1.0 pts

1.0 pts

2.0 pts

1.0 pts

2.0 pts

1.0 pts

1.0 pts

Files Correctly Submitted

Submitted file is correct assignment and is an individual

.asm file.

1.0 pts

Full Marks

0.0 pts

No Marks

Program Assembles & Links

Submitted program assembles and links without need for

clarifying work for TA and/or messages to the student. This

assumes the program is actually an attempt at the

assignment. Non-attempts which compile/link earn no

points.

1.0 pts

Full Marks

0.0 pts

No Marks

Documentation - Identification Block - Header

Name, Date, Program number, etc as per syllabus are

included in Identification Block

1.0 pts

Full Marks

0.0 pts

No Marks

Documentation - Identification Block - Program Description

Description of functionality and purpose of program is

included in identification block.

1.0 pts

Full Marks

0.0 pts

No Marks

Documentation - Procedure Headers

Procedure headers describe functionality and

implementation of program flow. Should also list pre- and

post-conditions and registers changed.

2.0 pts

Full

Marks

1.0 pts

Conditions

Descriptive

lacking pre- and

post-conditions

and 'registers

changed'

0.0 pts

No

Marks

Documentation - In-line Comments

In-line comments contribute to understanding of program

flow (from section comments) but are not line-by-line

descriptions of moving memory to registers.

1.0 pts

Full Marks

0.0 pts

No Marks

Program Executes

Program executes and makes some attempt at the

assigned functionality.

2.0 pts

Full Marks

0.0 pts

No Marks

Completeness - Displays Title & Programmer Name

Program prints out the programmer's name and Program

Title

1.0 pts

Full Marks

0.0 pts

No Marks

Completeness - Displays Introduction

Displays program introduction. Program introduction

should describe functionality of program.

1.0 pts

Full Marks

0.0 pts

No Marks

2020/7/28 Program #4

https://canvas.oregonstate.edu/courses/1776058/assignments/7977476 5/7

Criteria Ratings Pts

2.0 pts

1.0 pts

1.0 pts

1.0 pts

1.0 pts

1.0 pts

1.0 pts

2.0 pts

2.0 pts

5.0 pts

2.0 pts

Completeness - Gets / Validates data from User

values in appropriately-named identifiers for validation. |

Validates that user-entered values are within the

2.0 pts

Full Marks

0.0 pts

No Marks

Completeness - Displays Unsorted List 1.0 pts

Full Marks

0.0 pts

No Marks

Completeness - Displays Median 1.0 pts

Full Marks

0.0 pts

No Marks

Completeness - Displays Sorted List 1.0 pts

Full Marks

0.0 pts

No Marks

Completeness - Lists are displayed 10 numbers per line 1.0 pts

Full Marks

0.0 pts

No Marks

Completeness - Lists are labeled "unsorted" and "sorted" 1.0 pts

Full Marks

0.0 pts

No Marks

Correctness - Array declaration

List array declared as 200 integers

1.0 pts

Full Marks

0.0 pts

No Marks

Correctness - Random Number Generation

Generates random numbers correctly in range

2.0 pts

Full Marks

0.0 pts

No Marks

Correctness - Fill Array

Stores random numbers consecutively in array

2.0 pts

Full Marks

0.0 pts

No Marks

Correctness - List is sorted in descending order 5.0 pts

Full

Marks

3.0 pts

Ascending order

List is sorted in

ascending

descending) order

0.0 pts

No

Marks

Correctness - Median Calculation

Correctly calculates and rounds median

2.0 pts

Full Marks

0.0 pts

No Marks

2020/7/28 Program #4

https://canvas.oregonstate.edu/courses/1776058/assignments/7977476 6/7

Criteria Ratings Pts

8.0 pts

5.0 pts

2.0 pts

2.0 pts

0.0 pts

0.0 pts

1.0 pts

1.0 pts

1.0 pts

Requirements - Modular Design

Uses procedures: main, introduction, getData, fillArray,

sortList, displayMedian, displayList

8.0 pts

Full

Marks

6.0 pts

All except

median

All procedures

exist and used

except

displayMedian.

Median

calculation done

in main or

grouped in other

procedure.

0.0 pts

No

Marks

Requirements - Parameter Passing

All parameters are passed to procedures on the system

stack (arrays, strings, and return values by OFFSET;

others by value)

5.0 pts

Full

Marks

3.0 pts

All but strings

Value-parameters

and return

parameters

passed on stack

but array/string

offsets are not.

0.0 pts

No

Marks

Requirements - displayList correctly used

Two different CALLs to the same displayList procedure

(one for the unsorted list, one for the sorted). If there are

two different list display procedures - zero points

2.0 pts

Full Marks

0.0 pts

No Marks

Requirements - Limits as CONSTANTS

Random range bounds and user input bounds are

declared and used as constants.

2.0 pts

Full Marks

0.0 pts

No Marks

Requirements - No non-CONSTANT global references

outside of main

Deduct 5 points if there are any non-CONSTANT global

references outside of MAIN

0.0 pts

Full Marks

0.0 pts

No Marks

Requirements - Correct Array Addressing Modes

Deduct 5 points if indirect addressing (register as pointer)

is not used for array processing.

0.0 pts

Full Marks

0.0 pts

No Marks

Coding Style - Uses appropriately named identifiers

Identifiers named so that a person reading the code can

intuit the purpose of a variable, constant, or label just by

1.0 pts

Full Marks

0.0 pts

No Marks

Coding Style - Readability

Program uses readable white-space, indentation, and

spacing as per the Indentation Style Guide. Logical

sections are separated by white space.

1.0 pts

Full Marks

0.0 pts

No Marks

Output Style - Readability

Program output is easy to read

1.0 pts

Full Marks

0.0 pts

No Marks

2020/7/28 Program #4

https://canvas.oregonstate.edu/courses/1776058/assignments/7977476 7/7

Total Points: 50.0

Criteria Ratings Pts

0.0 pts

0.0 pts

Extra Credit

Displays the numbers ordered by column instead of by row

(1 pt)

Implements recursive merge sort algorithm (3)

0.0 pts

Full Marks

0.0 pts

No Marks

Late Penalty

Remove points here for late assignments. (Enter negative

point value)

0.0 pts

Full Marks

0.0 pts

No Marks

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