This an semester Project created concerning the college course "MICROPROCESSORS". A Simple yet Complex assembly project made using emu8086
This project was created using the instruction set of x86 and modified based on functional programming and error detection to produce a more efficient code.
Project Description
This a simulator for a Book Store program that has the following features:
-
Purchase a subscription with many types ( Weekly - Monthly - Annually ).
-
Purchase More than one subscription ( 00 - 99 ).
-
Printing Out A formatted bill with the total price
-
View the available books to be purchased in the offline store.
-
Display information about the store and the categories of books in it.
-
Option to exit the program directly.
The program has some logos for a better UI experience, these logos are:
- logo1 ( BOOK STORE )
"888888b. 888 .d8888b. 888 ",13,
'888 "88b 888 d88P Y88b 888 ',13,
"888 .88P 888 Y88b. 888 ",13,
'8888888K. .d88b. .d88b. 888 888 "Y888b. 888888 .d88b. 888d888 .d88b. ',13,
'888 "Y88b d88""88b d88""88b 888 .88P "Y88b. 888 d88""88b 888P" d8P Y8b ',13,
'888 888 888 888 888 888 888888K "888 888 888 888 888 88888888 ',13,
'888 d88P Y88..88P Y88..88P 888 "88b Y88b d88P Y88b. Y88..88P 888 Y8b. ',10,13,
'8888888P" "Y88P" "Y88P" 888 888 "Y8888P" "Y888 "Y88P" 888 "Y8888 ',10,13,"$"- logo2 ( WELCOME )
" +-+-+-+-+-+-+-+ ",10,13,
" |W|E|L|C|O|M|E| ",10,13,
" +-+-+-+-+-+-+-+ ",10,13,"$"- logo3 ( WELCOME BACK )
" +-+-+-+-+-+-+-+ +-+-+-+-+ +-+-+-+-+-+ ",10,13,
" |W|E|L|C|O|M|E| |B|A|C|K| |A|G|A|I|N| ",10,13,
" +-+-+-+-+-+-+-+ +-+-+-+-+ +-+-+-+-+-+ ",10,13,
" ",3,3,3,3,3,3,3,3,3,10,13,"$"- logo4 ( GOODBYE )
" +-+-+-+-+-+-+-+ ",10,13,
" |G|O|O|D|B|Y|E| ",10,13,
" +-+-+-+-+-+-+-+ ",10,13,"$" Also As Mentioned This Program is Based on Functional Programming as we reduced the code by making some MACROS and PROCEDURES, and those are:
- Print Function That takes a Parameter (str) Pointing to the variable holding the data to be printed.
macro Print str
mov dx,offset str
mov ah,9
int 21h
endm- Returning function That is produced after finishing each action that the user take Like Purchasing A Subscription.
macro Returning
Print Return ;Return is A variable holding a message to be displayed
call GetInput ;the input will be saved in "al"
push ax
call NEWLINE_LOOP ;A Procedure to print new line for 15 times for some clean formatting
pop ax
cmp al, 'y'
je Start ;if the input that is saved in "al" is equal to "y" or "Y"
cmp al, 'Y' ;The Program will go to the start and begin again
je Start
;==else==;
jmp ToEnd
endm- Count Macro that is used to calculate the total price of number of subscriptions
macro count value
mov al, value
mov bl, membership_num
mul bl
mov result , ax
jmp PRINT_RESULT
endm- GetInput Procedure that is called whenever the program is performing an input request.
GetInput proc
mov ah, 1 ;take one char as input and save it in "al"
int 21h
ret
GetInput endp... The Program Flow Works As Follows, At Startup The Main Menu Will Be Displayed For The Customer Like That
So The Customer has Four Options To Choose From ... and Here comes the first error handling in our program, if the user entered any number rather than ( 1, 2, 3, 4 ) the program will produce an error message for the user and ask him to enter the correct choice
this error handling is produced using the following piece of code
;===== Getting The Menu Choise =====;
get_choice:
call GetInput ; read the user choice <saved as ascii code>
cmp al, '1' ; first choice
je FIRST_CHOICE
cmp al, '2' ; second choice > Viewing info about the books
je SECOND_CHOICE
cmp al, '3' ; third choice > Viewing AboutUS
je THIRD_CHOICE
cmp al, '4' ; Exit the application
je ToEnd
;;;;; loop back to get_choice until the user choice is correct ;;;;;
Print wrong_choice
jmp get_choice First Choice
Now lets consider a customer wishing to purchase number of subscriptions, so he entered ( 1 ) to choose from the main menu, the program will detect that there is no error in the input and will continue to display the menu of subscriptions prices for the user
... the user must choose the type of the membership as a number between ( 1 - 6 ), if the input is not in this range there is some error handling code to make the user input the right choice
FIRST_CHOICE:
Print membership_menu ;display the membership prices message
GET_INPUT_AGAIN:
call GetInput ; read the user choice (What membership?)
;== handle the user input ==;
;== check input if in range (1-6) ==;
cmp al, '0'
je check1failed
cmp al, '6'
jle CONTINUED
check1failed:
Print NewLine
Print wrong_choice2
jmp GET_INPUT_AGAIN ; loop back to get_choice until the user choice is correct ;
CONTINUED:
mov membership_type, al
Print NewLineafter that the program will display a message to ask the user to enter the number of subscription he wants between ( 00 - 99 ) and calculate the total price and print out the bill and ask the user if he wants to go back to the main menu again
Print membership_amount ;display the membership_amount
;===== First digit =====;
call GetInput ; Get the number of Memberships
SUB AL, 30H ; converting first digit from ascii to number
MOV AH, 0
MOV BL, 10
MUL BL
MOV BL, AL
;===== Second digit =====;
call GetInput
SUB AL, 30H ; convert second digit from ascii to number
MOV AH, 0
ADD AL, BL
mov membership_num, al
Print NewLine
;===== Comparing Which Membership Triggered =====;
cmp membership_type, '1'
je ADULT_0
cmp membership_type, '2'
je CHILD_0
cmp membership_type, '3'
je ADULT_M
cmp membership_type, '4'
je CHILD_M
cmp membership_type, '5'
je ADULT_Y
cmp membership_type, '6'
je CHILD_Y
;==== based on the type of subscription the user choosed ====;
;==== we bass the price of the subscription to the count function ====;
ADULT_0:
Count adult
CHILD_0:
Count child
ADULT_M:
Count adultM
CHILD_M:
Count childM
ADULT_Y:
Count adultY
CHILD_Y:
Count childY
;=== After that we store the result produced by count macro into an array to print it ===;
PRINT_RESULT:
Print Total_msg
mov ax, result
mov result, 0
;===== convert decimal to hex to print result =====;
LEA SI, RES
MOV CX,0
MOV BX,10
LOOP1:
MOV DX,0
DIV BX ;DX:AX/BX >> res in AX and reminder in DX
ADD DL,30H
PUSH DX
INC CX
CMP AX,9
JG LOOP1
ADD AL,30H
MOV [SI],AL
LOOP2:
POP AX
INC SI
MOV [SI],AL
LOOP LOOP2
Print RES
Print NewLine
Print NewLine
ReturningSecond Choice
IF the user decided to go back again to the main menu the program will start over and print the welcome logo and this time lets consider a user choosing the second choice
the program will again check if there is any errors to be handled then will proceed to display the list of books available in the store to be purchased offline.
;===== Checking Prices And Offers =====;
SECOND_CHOICE:
Print INFO
ReturningThird Choice
if user wants to know more about the Book Store then his choice will be ( 3 ) and the program will print out some info ...
Fourth Choice
This Choice gives the user the option to end the program, the program will do so and return control to the OS but first it will produce a GOODBYE message.
cmp al, '4' ; Exit the application
je ToEnd
;;;;;;;;; Ending The Program ;;;;;;;;;;;;
ToEnd:
Print GoodBye
.exit
end mainWe started working on this project in "Nov 14, 2021" and finished on "Jan 5, 2022" and the contributors involved in this work are
| NAME | GitHub ACCOUNT |
|---|---|
| Diaa El-Dein Hassan Kamal | BU9D4DDY |
| Ramzi Muhammad Ramzi | RamziMohamad |
| Abd El-Rahman Atef El-Sayed | Abdelrahman-Atef-Elsayed |
| Abdullah Hamdy Saleh | Abdullahh74 |
| Ali Ahmed Saeid | AliAhmed3 |
and here is a screenshot of the workflow using GitKraken software ...
Also We have released two releases during this
