Write a program that uses an array of DWORD decimal integers defined in the .dat

Question

Write a program that uses an array of DWORD decimal integers defined in the .data section of your program, and a procedure named BubbleSort that takes as arguments:

A PTR DWORD argument for the array

A DWORD argument for the size of the array

and performs the BubbleSort algorithm such that the array contents are sorted by the BubbleSort procedure. The array contents defined in the .data section of your program should have all of its DWORD integer elements sorted by the time the main program exits it’s execution. You should use a main program that has the following definition and invocation of BubbleSort:

main PROC

call Clrscr

INVOKE BubbleSort, OFFSET ,<your first argument>, <your second argument>

exit

main ENDP

Explanation / Answer

.MODEL SMALL
.STACK 100H

.DATA
PROMPT_1 DB 'The contents of the array before sorting : $'
PROMPT_2 DB 0DH,0AH,'The contents of the array after sorting : $'

ARRAY DB 5,3,9,0,2,6,1,7,8,4   

.CODE
MAIN PROC
MOV AX, @DATA ; initialize DS
MOV DS, AX

MOV BX, 10 ; set BX=10

LEA DX, PROMPT_1 ; load and display the string PROMPT_1
MOV AH, 9
INT 21H

LEA SI, ARRAY ; set SI=offset address of ARRAY

CALL PRINT_ARRAY ; call the procedure PRINT_ARRAY

LEA SI, ARRAY ; set SI=offset address of the ARRAY

CALL BUBBLE_SORT ; call the procedure BUBBLE_SORT

LEA DX, PROMPT_2 ; load and display the string PROMPT_2
MOV AH, 9
INT 21H

LEA SI, ARRAY ; set SI=offset address of ARRAY

CALL PRINT_ARRAY ; call the procedure PRINT_ARRAY

MOV AH, 4CH ; return control to DOS
INT 21H
MAIN ENDP

PRINT_ARRAY PROC
; this procedure will print the elements of a given array
; input : SI=offset address of the array
; : BX=size of the array
; output : none

PUSH AX ; push AX onto the STACK   
PUSH CX ; push CX onto the STACK
PUSH DX ; push DX onto the STACK

MOV CX, BX ; set CX=BX

@PRINT_ARRAY: ; loop label
XOR AH, AH ; clear AH
MOV AL, [SI] ; set AL=[SI]

CALL OUTDEC ; call the procedure OUTDEC

MOV AH, 2 ; set output function
MOV DL, 20H ; set DL=20H
INT 21H ; print a character

INC SI ; set SI=SI+1
LOOP @PRINT_ARRAY ; jump to label @PRINT_ARRAY while CX!=0

POP DX ; pop a value from STACK into DX
POP CX ; pop a value from STACK into CX
POP AX ; pop a value from STACK into AX

RET ; return control to the calling procedure
PRINT_ARRAY ENDP

BUBBLE_SORT PROC
; this procedure will sort the array in ascending order
; input : SI=offset address of the array
; : BX=array size
; output : none

PUSH AX ; push AX onto the STACK
PUSH BX ; push BX onto the STACK
PUSH CX ; push CX onto the STACK
PUSH DX ; push DX onto the STACK
PUSH DI ; push DI onto the STACK

MOV AX, SI ; set AX=SI
MOV CX, BX ; set CX=BX
DEC CX ; set CX=CX-1

@OUTER_LOOP: ; loop label
MOV BX, CX ; set BX=CX

MOV SI, AX ; set SI=AX
MOV DI, AX ; set DI=AX
INC DI ; set DI=DI+1

@INNER_LOOP: ; loop label
MOV DL, [SI] ; set DL=[SI]

CMP DL, [DI] ; compare DL with [DI]
JNG @SKIP_EXCHANGE ; jump to label @SKIP_EXCHANGE if DL<[DI]

XCHG DL, [DI] ; set DL=[DI], [DI]=DL
MOV [SI], DL ; set [SI]=DL

@SKIP_EXCHANGE: ; jump label
INC SI ; set SI=SI+1
INC DI ; set DI=DI+1

DEC BX ; set BX=BX-1
JNZ @INNER_LOOP ; jump to label @INNER_LOOP if BX!=0
LOOP @OUTER_LOOP ; jump to label @OUTER_LOOP while CX!=0

POP DI ; pop a value from STACK into DI
POP DX ; pop a value from STACK into DX
POP CX ; pop a value from STACK into CX
POP BX ; pop a value from STACK into BX
POP AX ; pop a value from STACK into AX

RET ; return control to the calling procedure
BUBBLE_SORT ENDP

OUTDEC PROC
; this procedure will display a decimal number
; input : AX
; output : none

PUSH BX ; push BX onto the STACK
PUSH CX ; push CX onto the STACK
PUSH DX ; push DX onto the STACK

XOR CX, CX ; clear CX
MOV BX, 10 ; set BX=10

@OUTPUT: ; loop label
XOR DX, DX ; clear DX
DIV BX ; divide AX by BX
PUSH DX ; push DX onto the STACK
INC CX ; increment CX
OR AX, AX ; take OR of Ax with AX
JNE @OUTPUT ; jump to label @OUTPUT if ZF=0

MOV AH, 2 ; set output function

@DISPLAY: ; loop label
POP DX ; pop a value from STACK to DX
OR DL, 30H ; convert decimal to ascii code
INT 21H ; print a character
LOOP @DISPLAY ; jump to label @DISPLAY if CX!=0

POP DX ; pop a value from STACK into DX
POP CX ; pop a value from STACK into CX
POP BX ; pop a value from STACK into BX

RET ; return control to the calling procedure
OUTDEC ENDP

END MAIN

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