.MODEL SMALL
.STACK 100H
.DATA
PROMPT_1 DB 'The Class Marks are as follows : ',0DH,0AH,'$'
PROMPT_2 DB 0DH,0AH,'The Average Marks are as follows : $'
AVERAGE DW 5 DUP(0)
MARKS DW 67,45,98,33 ; Mary Allen
DW 70,56,87,44 ; Scott Baylis
DW 82,72,89,40 ; George Frank
DW 80,67,95,50 ; Beth Harris
DW 78,76,92,60 ; Sam Wong
.CODE
MAIN PROC
MOV AX, @DATA ; initialize DS
MOV DS, AX
LEA DX, PROMPT_1 ; load and print the string PROMPT_1
MOV AH, 9
INT 21H
LEA SI, MARKS ; set SI=offset address of variable MARKS
MOV BH, 5 ; set BH=5
MOV BL, 4 ; set BL=4
CALL PRINT_2D_ARRAY ; call the procedure PRINT_2D_ARRAY
XOR SI, SI ; clear SI
MOV CX, 4 ; set CX=4
@COMPUTE_AVERAGE: ; loop label
XOR AX, AX ; clear AX
XOR BX, BX ; clear BX
MOV DX, 5 ; set DX=5
@SUM: ; loop label
ADD AX, MARKS[BX+SI] ; set AX=AX+MARKS[BX+SI]
ADD BX, 8 ; set BX=BX+8
DEC DX ; set DX=DX-1
JNZ @SUM ; jump to label @SUM if DX!=0
MOV BX, 5 ; set BX=5
DIV BX ; set AX=DX:AX/BX , DX=DX:AX%BX
MOV AVERAGE[SI], AX ; set AVERAGE[SI]=AX
ADD SI, 2 ; set SI=SI+2
LOOP @COMPUTE_AVERAGE ; jump to label @COMPUTE_AVERAGE while CX!=0
LEA DX, PROMPT_2 ; load and print the string PROMPT_2
MOV AH, 9
INT 21H
LEA SI, AVERAGE ; set SI=offset address of variable AVERAGE
MOV BX, 4 ; set BX=4
CALL PRINT_ARRAY ; call the procedure PRINT_ARRAY
MOV AH, 4CH ; return control to DOS
INT 21H
MAIN ENDP
;**************************************************************************;
;**************************************************************************;
;------------------------- Procedure Definitions ------------------------;
;**************************************************************************;
;**************************************************************************;
;**************************************************************************;
;----------------------------- PRINT_ARRAY ------------------------------;
;**************************************************************************;
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
MOV AX, [SI] ; set AX=AX+[SI]
CALL OUTDEC ; call the procedure OUTDEC
MOV AH, 2 ; set output function
MOV DL, 20H ; set DL=20H
INT 21H ; print a character
ADD SI, 2 ; set SI=SI+2
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
;**************************************************************************;
;----------------------------- PRINT_2D_ARRAY ---------------------------;
;**************************************************************************;
PRINT_2D_ARRAY PROC
; this procedure will print the given 2D array
; input : SI=offset address of the 2D array
; : BH=number of rows
; : BL=number of columns
; output : none
PUSH AX ; push BX onto the STACK
PUSH CX ; push CX onto the STACK
PUSH DX ; push DX onto the STACK
PUSH SI ; push SI onto the STACK
MOV CX, BX ; set CX=BX
@OUTER_LOOP: ; loop label
MOV CL, BL ; set CL=BL
@INNER_LOOP: ; loop label
MOV AH, 2 ; set output function
MOV DL, 20H ; set DL=20H
INT 21H ; print a character
MOV AX, [SI] ; set AX=[SI]
CALL OUTDEC ; call the procedure OUTDEC
ADD SI, 2 ; set SI=SI+2
DEC CL ; set CL=CL-1
JNZ @INNER_LOOP ; jump to label @INNER_LOOP if CL!=0
MOV AH, 2 ; set output function
MOV DL, 0DH ; set DL=0DH
INT 21H ; print a character
MOV DL, 0AH ; set DL=0AH
INT 21H ; print a character
DEC CH ; set CH=CH-1
JNZ @OUTER_LOOP ; jump to label @OUTER_LOOP if CX!=0
POP SI ; pop a value from STACK into SI
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
PRINT_2D_ARRAY ENDP
;**************************************************************************;
;-------------------------------- OUTDEC --------------------------------;
;**************************************************************************;
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
;**************************************************************************;
;**************************************************************************;
;------------------------------ THE END ---------------------------------;
;**************************************************************************;
;**************************************************************************;