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Program that prompts the user to enter a string of decimal digits, ending with a carriage retuen, and prints their sum in hex......

Posted By: Easy Tutor     Category: Assembly Language     Views: 6965

An AL program that prompts the user to enter a string of decimal digits, ending with a carriage retuen, and prints their sum in hex on the next line. If the user enters an illegal character, he or she should be prompted to begin again.

Code for Program that prompts the user to enter a string of decimal digits, ending with a carriage retuen, and prints their sum in hex...... in Assembly Language

 .MODEL SMALL
 .STACK 100H

 .DATA
   PROMPT_1  DB  'Enter a decimal digit string : $'
   PROMPT_2  DB  0DH,0AH,'The sum of the decimal digit string in Hex is : $'
   ILLEGAL   DB  0DH,0AH,'Illegal character. Try again : $'

   TEMP      DW  ?
   VALUE     DW  ?
   v         dw  ?

 .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

     JMP @START_2                 ; jump to label @START_2 

     @START_1:                    ; jump label
       LEA DX, ILLEGAL            ; load and display the string ILLEGAL 
       MOV AH, 9
       INT 21H

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

     @START_2:                    ; jump label
       MOV AH, 1
       INT 21H

       INC CX                     ; increment CX

       CMP AL, 0DH                ; compare AL with CR
       JNE @SKIP                  ; jump to label @SKIP if AL!=CR

       CMP CX, 1                  ; compare CX with 1
       JB @START_1                ; jump to label @START_1 if CX<1
       JMP @END_INPUT             ; jump to label @END_INPUT

       @SKIP:                     ; jump label

       CMP AL, 30H                ; compare AL with 0
       JB @START_1                ; jump to label @START_1 of AL<0

       CMP AL, 39H                ; compare AL with 1
       JA @START_1                ; jump to label @START_1 if AL>9

       AND AL, 0FH                ; convert the ascii to decimal code
       XOR AH, AH                 ; clear AH
       ADD BX, AX                 ; add BX and AX

       JMP @START_2               ; jump to label @START_2

     @END_INPUT:                  ; jump label

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

     MOV CX, 4                    ; initialize loop counter
     MOV AH, 2                    ; set output function

     @LOOP_1:                     ; loop label
       XOR DX, DX                 ; clear DX

       @LOOP_2:                   ; jump label
         SHL BX, 1                ; shift BX towards left by 1 position
         RCL DL, 1                ; rotate DL towards left by 1 position
         INC DH                   ; increment DH
         CMP DH, 4                ; compare DH with 4
       JNE @LOOP_2                ; jump to label @LOOP_2 if DH!=4

       CMP DL, 9                  ; compare DL with 9
       JBE @NUMERIC_DIGIT         ; jump to label @NUMERIC_DIGIT if DL<=9
       SUB DL, 9                  ; convert it to number i.e. 1,2,3,4,5,6
       OR DL, 40H                 ; convert number to letter i.e. A,B...F
       JMP @DISPLAY               ; jump to label @DISPLAY

       @NUMERIC_DIGIT:            ; jump label
         OR DL, 30H               ; convert decimal to ascii code

       @DISPLAY:                  ; jump label
         INT 21H                  ; print the character
     LOOP @LOOP_1                 ; jump to label @LOOP_1 if CX!=0

     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 of decimal digits, ending with a carriage retuen, and prints their sum in hex...... is from United States. Easy Tutor says

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