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# Program that will compute the class average on each exam

Posted By: Easy Tutor     Category: Assembly Language     Views: 4048

## Code for Program that will compute the class average on each exam in Assembly Language

``` .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

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

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

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

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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