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Program that let the user to enter a fraction of the form M/N s.t. (M<N), and the program prints the expansion..........

Posted By: Easy Tutor     Category: Assembly Language     Views: 2212

Code for Program that let the user to enter a fraction of the form M/N s.t. (M&lt;N), and the program prints the expansion.......... in Assembly Language

``` .MODEL SMALL
.STACK 100H

.DATA
PROMPT_1  DB  'Enter the value of M = \$'
PROMPT_2  DB  0DH,0AH,'Enter the value of N ( N>M ) = \$'
PROMPT_3  DB  0DH,0AH,'Result = ( M/N ) = \$'

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

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

CALL INDEC                   ; call the procedure INDEC

PUSH AX                      ; push AX onto the STACK

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

CALL INDEC                   ; call the procedure INDEC

MOV BX, AX                   ; set BX=AX

LEA DX, PROMPT_3             ; load and display the string PROMPT_3
MOV AH, 9
INT 21H

MOV AH, 2                    ; set output function

MOV DL, "0"                  ; set DL=0
INT 21H                      ; print a character

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

POP AX                       ; pop a value from STACK into AX
MOV CX, BX                   ; set CX=BX

@REPEAT:                     ; jump label
MOV DL, 10                 ; set DL=10
MUL DL                     ; set AX=AX*DL

XOR DX, DX                 ; clear DX
DIV BX                     ; set AX=DX:AX\BX , set DX=DX:AX%BX

CALL OUTDEC                ; call the procedure OUTDEC

MOV AX, DX                 ; set AX=DX

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

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

;**************************************************************************;
;-------------------------------  INDEC  ----------------------------------;
;**************************************************************************;

INDEC PROC
; this procedure will read a number indecimal form
; input : none
; output : store binary number in AX
; uses : MAIN

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

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

XOR BX, BX                     ; clear BX
XOR CX, CX                     ; clear CX
XOR DX, DX                     ; clear DX

MOV AH, 1                      ; set input function
INT 21H                        ; read a character

CMP AL, "-"                    ; compare AL with "-"

CMP AL, "+"                    ; compare AL with "+"

@MINUS:                        ; jump label
MOV CH, 1                      ; set CH=1
INC CL                         ; set CL=CL+1

@PLUS:                         ; jump label
MOV CH, 2                      ; set CH=2
INC CL                         ; set CL=CL+1

@INPUT:                        ; jump label
MOV AH, 1                    ; set input function
INT 21H                      ; read a character

@SKIP_INPUT:                 ; jump label

CMP AL, 0DH                  ; compare AL with CR

CMP AL, 8H                   ; compare AL with 8H

CMP CH, 0                    ; compare CH with 0

CMP CL, 0                    ; compare CL with 0

@CHECK_REMOVE_MINUS:         ; jump label

CMP CH, 1                    ; compare CH with 1

CMP CL, 1                    ; compare CL with 1

@CHECK_REMOVE_PLUS:          ; jump label

CMP CL, 1                    ; compare CL with 1

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

MOV DL, 8H                 ; set DL=8H
INT 21H                    ; print a character

@MOVE_BACK:                  ; jump label

MOV AX, BX                   ; set AX=BX
MOV BX, 10                   ; set BX=10
DIV BX                       ; set AX=AX/BX

MOV BX, AX                   ; set BX=AX

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

MOV DL, 8H                   ; set DL=8H
INT 21H                      ; print a character

XOR DX, DX                   ; clear DX
DEC CL                       ; set CL=CL-1

@NOT_BACKSPACE:              ; jump label

INC CL                       ; set CL=CL+1

CMP AL, 30H                  ; compare AL with 0

CMP AL, 39H                  ; compare AL with 9

AND AX, 000FH                ; convert ascii to decimal code

PUSH AX                      ; push AX onto the STACK

MOV AX, 10                   ; set AX=10
MUL BX                       ; set AX=AX*BX
MOV BX, AX                   ; set BX=AX

POP AX                       ; pop a value from STACK into AX

ADD BX, AX                   ; set BX=AX+BX

@ERROR:                        ; jump label

MOV AH, 2                      ; set output function
MOV DL, 7H                     ; set DL=7H
INT 21H                        ; print a character

XOR CH, CH                     ; clear CH

@CLEAR:                        ; jump label
MOV DL, 8H                   ; set DL=8H
INT 21H                      ; print a character

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

MOV DL, 8H                   ; set DL=8H
INT 21H                      ; print a character

@END_INPUT:                    ; jump label

CMP CH, 1                      ; compare CH with 1
NEG BX                         ; negate BX

@EXIT:                         ; jump label

MOV AX, BX                     ; set AX=BX

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
INDEC ENDP

;**************************************************************************;
;--------------------------------  OUTDEC  --------------------------------;
;**************************************************************************;

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

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

CMP AX, 0                      ; compare AX with 0

PUSH AX                        ; push AX onto the STACK

MOV AH, 2                      ; set output function
MOV DL, "-"                    ; set DL='-'
INT 21H                        ; print the character

POP AX                         ; pop a value from STACK into AX

NEG AX                         ; take 2's complement of AX

@START:                        ; jump label

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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