Question

I would love help with the following exercise in Assembly language:

The objective of this exercise is to write a procedure that will convert the ASCII code of a digit d into the value v of d, and store v in the register DL. The procedure uses the register AL as a parameter. AL contains the ASCII code of a hexadecimal digit d (‘0’ to ‘F’): 30h-39h and 41h-46h. You do not have to test AL for the range. The procedure must store in the register DL the value of the digit.

Examples:
1) If AL contains the ASCII code 34h (ASCII code of ‘4’), the procedure must store in DL the value of the digit ‘4’, i.e., the value 04h. Ultimately, DL = 04h.
2) If AL contains the ASCII code 44h (ASCII code of ‘D’), the procedure must store in DL the value of the digit ‘D’, i.e., the value 0Dh. Ultimately, DL = 0Dh.

Thank you!

Answer 1

Please find the code below:::::

.model small
.stack 100h
.data

;prompt for input
printName db 'Mohammad Shahrukh $'

;it wil print message
print? db '? $'


printNextSeqLine db 'The following character in sequence is: $'   

.code
main proc

;to print counter
Mov bl,'0'

mov ax,@data ;move data address to ax
mov ds,ax ;move ax to data segment   
  
  
lea dx , printName ;if use lea no need to use offset
mov ah,9 ;ask to print array of string
int 21h


mov dx,10 ;print \n
mov ah,2
int 21h

mov dx,13 ;cursor at first position
mov ah,2
int 21h

lea dx , print? ;if use lea no need to use offset
mov ah,9 ;ask to print array of string
int 21h

mov ah,1 ;input character
int 21h
  
mov cl,al

mov dx,10 ;print \n
mov ah,2
int 21h

mov dx,13 ;cursor at first position
mov ah,2
int 21h
  
  
lea dx , printNextSeqLine ;if use lea no need to use offset
mov ah,9 ;print message
int 21h




add cl,1 ;add one to the input

mov dl,cl ;move data to dl
mov ah,2 ;print ah
int 21h

mov ah,4ch
int 21h  

main endp
end main

output: