I need to create a string in assembly that will output the string back, backward

Question

I need to create a string in assembly that will output the string back, backwards. Example "Hello" to "olleH"

This is my code so far:

INCLUDE Irvine32.inc

.data
myString BYTE 80 DUP (?)
MAX = 80

.code
Main PROC
call Clrscr

mov edx,OFFSET myString  ;buffer size -1
mov ecx,MAX
call ReadString
call StrLength  ;stores string length in eax

xor edx,edx
mov ebx,2
div ebx
mov ecx,eax

L1:
;insert code here
call WriteInt
call Crlf
inc eax
loop L1
mov edx,OFFSET myString
call WriteString

exit
main ENDP

END main

Explanation / Answer

Hi, You Can use below written Assembly Language code to achive your goal. It is a simple assembly program will help you clearing your concepts.

DATA SEGMENT
STR1 DB "HELLO!$"
STR2 DB DUP ('$')
MSG1 DB 10,13,'STORED STRING IN MEMORY IS : $'
MSG2 DB 10,13,'REVERSE STRING IS : $'
DATA ENDS
DISPLAY MACRO MSG
MOV AH,9
LEA DX,MSG
INT 21H
ENDM   
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START:
MOV AX,DATA
MOV DS,AX

DISPLAY MSG1
  
DISPLAY STR1

LEA SI,STR2
LEA DI,STR1
ADD DI,5

MOV CX,6
REVERSE:
MOV AL,[DI]
MOV [SI],AL
INC SI
DEC DI
LOOP REVERSE

DISPLAY MSG2

DISPLAY STR2

MOV AH,4CH
INT 21H
CODE ENDS
END START

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