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Program that will print the name of each student and his or her average ( truncated to an integer) for the four exams

Posted By: Easy Tutor     Category: Assembly Language     Views: 7373

Code for Program that will print the name of each student and his or her average ( truncated to an integer) for the four exams in Assembly Language

```
;**************************************************************************;
;                                                                          ;
;      By :                                                              ;
;        B.C.S Honours  [ 2000-04 ]                                  ;
;        Government College University Lahore                        ;
;        Pakistan                                                    ;
;                                                                          ;
;    E-mail :  mtshome@wol.net.pk                                          ;
;                                                                          ;
;  Web-Site :  www.mts-home.cjb.net  [ www.wol.net.pk/mtshome ]            ;
;        www.mtshome.cjb.net   [ www.geocities.com/mtahirshahzad ]   ;
;                                             ;
;                                                                          ;
;**************************************************************************;

TITLE AL-079 : An AL Program that will print the name of each student and
; his or her average ( truncated to an integer) for the four
; exams.
; Suppose the class records are stored as follows:
; CLASS  DB  'Mary Allen  ',67,45,98,33
;        DB  'Scott Baylis',70,56,87,44
;        DB  'George Frank',82,72,89,40
;        DB  'Sam Wong    ',78,76,92,60
; Note : Each name occupies 12 bytes.

.MODEL SMALL
.STACK 100H

.DATA
PROMPT_1   DB  'The Class Marks are as follows : ',0DH,0AH,'\$'
PROMPT_2   DB  0DH,0AH,'The Average Marks of Students are as follows : ',0DH,0AH,'\$'

AVERAGE  DW  4 DUP(0)
CLASS   DB  'Mary Allen  ',67,45,98,33
DB  'Scott Baylis',70,56,87,44
DB  'George Frank',82,72,89,40
DB  'Sam Wong    ',78,76,92,60

.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, CLASS                ; set SI=offset address of variable CLASS
MOV BH, 4                    ; set BH=4
MOV BL, 16                   ; set BL=16

CALL PRINT_2D_ARRAY          ; call the procedure PRINT_2D_ARRAY

LEA DI, AVERAGE              ; set DI=offset address of variable AVERAGE
LEA SI, CLASS                ; set SI=offset address of variable CLASS
ADD SI, 12                   ; set SI=SI+12
MOV CX, 4                    ; set CX=4

@COMPUTE_AVERAGE:            ; loop label
XOR AX, AX                 ; clear AX
MOV DX, 4                  ; set DX=4

@SUM:                      ; loop label
XOR BH, BH               ; clear BH
MOV BL, [SI]             ; set BL=[SI]

ADD AX, BX               ; set AX=AX+BX

INC SI                   ; set SI=SI+1
DEC DX                   ; set DX=DX-1

MOV BX, 4                  ; set BX=4
DIV BX                     ; set AX=DX:AX/BX , DX=DX:AX%BX

MOV [DI], AX               ; set [DI]=AX
ADD DI, 2                  ; set DI=DI+2
ADD SI, 12                 ; set SI=SI+12

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
LEA DI, CLASS                ; set DI=offset address of variable CLASS
MOV CX, 4                    ; set CX=4

@PRINT_RESULT:               ; loop label
MOV BX, 12                 ; set BX=12
MOV AH, 2                  ; set output function

@NAME:                     ; loop label
MOV DL, [DI]             ; set DL=[DI]
INT 21H                  ; print a character

INC DI                   ; set DI=DI+1
DEC BX                   ; set BX=BX-1

MOV DL, 20H                ; set DL=20H
INT 21H                    ; print a character

MOV DL, ":"                ; set DL=":"
INT 21H                    ; print a character

MOV DL, 20H                ; set DL=20H
INT 21H                    ; print a character

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, 0DH                ; carriage return
INT 21H

MOV DL, 0AH                ; line feed
INT 21H

ADD SI, 2                  ; set SI=SI+2
ADD DI, 4                  ; set DI=DI+4

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

;**************************************************************************;
;**************************************************************************;
;-------------------------  Procedure Definitions  ------------------------;
;**************************************************************************;
;**************************************************************************;

;**************************************************************************;
;-----------------------------  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
MOV AH, 2                    ; set output function

@PRINT_NAME:                 ; loop label
MOV DL, [SI]               ; set DL=[SI]
INT 21H                    ; print a character

INC SI                     ; set SI=SI+1
DEC CL                     ; set CL=CL-1

CMP CL, 4                  ; compare CL with 4

MOV DL, 20H                  ; set DL=20H
INT 21H                      ; print a character

@INNER_LOOP:                 ; loop label
MOV AH, 2                  ; set output function
MOV DL, 20H                ; set DL=20H
INT 21H                    ; print a character

XOR AH, AH
MOV AL, [SI]               ; set AX=[SI]

CALL OUTDEC                ; call the procedure OUTDEC

INC SI                     ; set SI=SI+1
DEC CL                     ; set CL=CL-1

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

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

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

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  ---------------------------------;
;**************************************************************************;
;**************************************************************************;
```
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