Write an Assembly Language procedure that encodes an original string using the f

Question

Write an Assembly Language procedure that encodes an original string using the following arrays
Code1 BYTE “SHO5FUP3IK8EZG9XC0NQLDB1WVY4TR7AM6J2”

Code2 BYTE “abcdefghijklmnopqrstuvwxyz0123456789”

The encoding works as follows: Each uppercase letter occurs somewhere in Code1. The procedure searches the array for the letter, notes the index of the array in which the letter occurs, and then uses this index in array Code2 to find the corresponding lowercase letter that encodes the uppercase one. For Example, suppose that the original string contains the letter H. Because H is stored at index 1 in Code1, H is encoded as b, because it is the character stored at index 1 in Code2. Characters in the original string that are not found in the array Code1 are unchanged.

Your procedure should accept three parameters in registers ESI, EDI and ECX as follows:

Offset address of the original string in ESI register.

Offset address of the encoded string in EDI register.

Length of the original string in ECX register.

An example of a dialogue with the user is as follows:

Enter a string (Max. 60 characters): Good Morning Oman
Your encoded string is: nccv 6c3sisn c65s

.data

OLDSTR BYTE 61 DUP(0); assume maximum string size of 60

NEWSTR BYTE 61 DUP(0) ;add any needed data definitions
.code

main PROC

; write your main procedure here
main ENDP
; add the Other procedures here
END main

Explanation / Answer

NAME DISPLAY_OF_LOWERSTRING_UPPERSTRING
ASSUME CS:CODE,DS:DATA

DATA SEGMENT

ORG 1000H

CODE1 DB 'SHO5FUP3IK8EZG9XC0NQLDB1WVY4TR7AM6J2'

CODE2 DB 'abcdefghijklmnopqrstuvwxyz0123456789'

  COUNT DW 17

SEARCH DB 'H'

FOUND DB 'STRING FOUND$'

NOT FOUND DB 'STRING NOT FOUND$'

DATA ENDS

CODE SEGMENT

ORG 2000H

START: MOV AX,DATA

MOV DS,AX

MOV CX,COUNT

MOV DI,OFFSET CODE1

MOV AL,SEARCH

REPNE SCASB

JZ YES

MOV DX,OFFSET NOT FOUND

MOV AH,09

INT 21H

JMP OVER

MOV SI,DI

YES:   MOV SI,OFFSET CODE2

MOV AL,SI

MOV DX,OFFSET FOUND

MOV AH,09

INT 21h

OVER:   MOV AH,4CH

INT 21H

CODE ENDS

END START

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