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Program that prompts the user to enter a string, then stores it in a variable using instruction STOSB....

Posted By: Easy Tutor     Category: Assembly Language     Views: 4331

An AL Program that prompts the user to enter a string, then stores it in a variable using instruction STOSB.

Code for Program that prompts the user to enter a string, then stores it in a variable using instruction STOSB.... in Assembly Language

 .MODEL SMALL
 .STACK 100H

 .DATA
   PROMPT  DB  'Enter a string : $'

   STRING  DB  25 DUP(?)
 
 .CODE
   MAIN PROC
     MOV AX, @DATA                ; initialize DS, ES
     MOV DS, AX
     MOV ES, AX

     LEA DX, PROMPT               ; load and print the string PROMPT
     MOV AH, 9
     INT 21H

     CLD                          ; clear direction flag
     LEA DI, STRING               ; set DI=offset address of variable STRING
     XOR BX, BX                   ; clear BX

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

       CMP AL, 0DH                ; compare AL with CR
       JE @END_INPUT              ; jump to label @END_INPUT if AL=CR

       CMP AL, 08H                ; compare AL with 08H
       JNE @NOT_BACKSPACE         ; jump to label @NOT_BACKSPACE if AL!=08H

       CMP BX, 0                  ; compare BX with 0
       JE @INPUT_ERROR            ; jump to label @INPUT_ERROR if BX=0

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

       MOV DL, 08H                ; set DL=08H
       INT 21H                    ; print a character

       DEC BX                     ; set BX=BX-1
       DEC DI                     ; set DI=DI-1
       JMP @INPUT_LOOP            ; jump to label @INPUT_LOOP

       @INPUT_ERROR:              ; jump label
       MOV AH, 2                  ; set output function
       MOV DL, 07H                ; set DL=07H
       INT 21H                    ; print a character

       MOV DL, 20H                ; set DL=20H
       INT 21H                    ; print a character
       JMP @INPUT_LOOP            ; jump to label @INPUT_LOOP      

       @NOT_BACKSPACE:            ; jump label
       STOSB                      ; set ES:[DI]=AL
       INC BX                     ; set BX=BX+1
       JMP @INPUT_LOOP            ; jump to label @INPUT_LOOP

     @END_INPUT:                  ; jump label
     
     MOV AH, 4CH                  ; return control to DOS
     INT 21H
   MAIN ENDP
 END MAIN
  
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Easy Tutor
Easy Tutor author of Program that prompts the user to enter a string, then stores it in a variable using instruction STOSB.... is from United States. Easy Tutor says

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