Assembly Language Programs

1) Write an ALP 16 convert HEX number, into its ASCII equipvalent.

Ans:-

.MODEL SMALL

.STACK 100H

.DATA

HEX DB 7h ; the HEX number to convert

ASCII DB 6 DUP ('$') ; allocate space for 6 ASCII characters

.CODE

MAIN PROC

MOV AX, @DATA ; initialize data segment

MOV DS, AX

MOV BL, HEX ; load HEX number into BL register

; convert first nibble to ASCII character

AND BL, 0FH ; mask off upper nibble

ADD BL, 30H ; convert to ASCII

CMP BL, 3AH ; check if character is between '0' and '9'

JBE WRITE_CHAR ; if yes, jump to WRITE_CHAR

ADD BL, 7H ; if no, add 7 to get 'A'-'F'

WRITE_CHAR:

MOV ASCII, BL ; store first ASCII character in memory

; convert second nibble to ASCII character

MOV BL, HEX ; reload HEX number into BL register

SHR BL, 4 ; shift right to get upper nibble

AND BL, 0FH ; mask off lower nibble

ADD BL, 30H ; convert to ASCII

CMP BL, 3AH ; check if character is between '0' and '9'

JBE WRITE_CHAR2 ; if yes, jump to WRITE_CHAR2

ADD BL, 7H ; if no, add 7 to get 'A'-'F'

WRITE_CHAR2:

MOV ASCII+1, BL ; store second ASCII character in memory

; display ASCII characters

MOV AH, 9 ; set output function

MOV DX, OFFSET ASCII ; load offset of ASCII string

INT 21H ; display string

MOV AH, 4CH ; exit program function

INT 21H ; return control to operating system

MAIN ENDP

END MAIN

2) Write an ALP to count number of 1 in 16-bit number.

Ans:-

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Thank You !

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