here is my Caesar cipher code, can u pls have a look at it and correct me if i'm wrong.
AREA text, CODE
SWI_Exit EQU &11
SWI_WriteC EQU &0
ENTRY
ADR r4, hello
ADR r3, alpha
ADR r2, key
loop
LDRB r0, [r4], #1
STRB r0, [r4], #1
CMP r0, #0
BNE check
SWI_Exit 0x11
check
LDRB r1, [r3], #1
STRB r1, [r3], #1
CMP r0, r1
BNE encrypt
B loop
encrypt
LDRB r5, [r2], #1
STRB r5,[r2], #1
MOV r0, r5
STRB r0,[r4], #1
SWINE SWI_WriteC
BEQ endP
B loop
hello DCB "THIS MESSEGE IS GOING TO BE ENCRYPTED ",0
alpha DCB "ABCDEFGHIJKLMNOPQRSTUVWXYZ",0
key DCB "XZYCJBTEKMGHONPEDCBAVWQLRU",0
endP
MOV pc, lr ; return
END
