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# Program that reads a binary number, stores it in BX, counts and displays the number of 1 bits in BX without changing the BX's contents.

Posted By: Easy Tutor     Category: Assembly Language     Views: 3486

## Code for Program that reads a binary number, stores it in BX, counts and displays the number of 1 bits in BX without changing the BX's contents. in Assembly Language

``` .MODEL SMALL
.STACK 100H

.DATA
PROMPT_1  DB  'Enter the binary number (max 16-bit) : \$'
PROMPT_2  DB  0DH,0AH,'The number of 1 bits is : \$'

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

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

XOR BX, BX                   ; clear BX
MOV CX, 16                   ; initialize loop counter
MOV AH, 1                    ; set input function

@INPUT:                      ; jump label
INT 21H                    ; read a digit
CMP AL, 0DH                ; compare digit with carriage return
AND AL, 0FH                ; convert ascii to decimal code
SHL BX, 1                  ; rotate BX to left by 1 bit
OR BL, AL                  ; set the LSB of BX with input

@END:                        ; jump label

MOV CX, 16                   ; initialize loop counter
XOR AX, AX                   ; clear AX

@LOOP:
ROL BX, 1                  ; rotate BX to left by 1 bit
INC AX                     ; increment AX

@NEXT:                       ; jump label

MOV CX, AX                   ; save AX in CX

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

MOV AH, 2                    ; set output function
CMP CL, 10                   ; compare the contents of CL

OR  CL, 30H                  ; convert decimal to Ascii code
MOV DL, CL                   ; set output value

@TWO_DIGIT:                  ; jump label
MOV DL, 31H                ; display digit 1
INT 21H

SUB CL, 10                 ; subtract 10 from CL
OR  CL, 30H                ; convert decimal to ASCII code
MOV DL, CL                 ; set output value

@DISPLAY:                    ; jump label
INT 21H                    ; display the value

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

;**************************************************************************;
;**************************************************************************;
;------------------------------  THE END  ---------------------------------;
;**************************************************************************;
;**************************************************************************;
```
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