I want to know why this program gives me an error.
Turbo Assembler Version 3.0 Copyright (c) 1988, 1991 Borland International
Assembling file: sample.asm
Error sample.asm(16) Illegal indexing mode
Error messages: 1
Warning message: none
Passes: 1
Remaining memory: 470k
title test.program
cstack segment para stack 'stack'
dw 200h
cstack ends
cdata segment para 'data'
msg1 db 'Sample progr! $'
cdata ends
ccode segment para 'code'
assume cs: ccode, ds: cdata ,ss: cstack
main:
mov cl,00
stri:
mov ah,02h
mov dl,[msg1 +cl] ;< this line give me an error of illegal indexing mode
int 21h
add cl,02
cmp dl,12
jbe stri
mov ah,4ch
int 21h
ccode ends
end main
If you want to use a register to loop through the characters of msg1 then use an indexing register like SI, DI, or BX.
When you add cl,2 you will not correctly display the string!
Comparing with 12 will not include the exclamation mark character.
main:
mov si,00
stri:
mov ah,02h
mov dl,[msg1 + si] ;< this line give me an error of illegal indexing mode
int 21h
add si,1
cmp si,13
jbe stri