my code supposed to count all character 'a' in every user input i use cmp if equal then my program jump to 'incre:' that increment the value of bl.the output is always this>¶< .i don't know where the problem is
title sample.prog
cstack segment para stack 'stack'
dw 200h
cstack ends
cdata segment para 'data'
msg1 db 'ENTER 9 CHARACTER: $',10,13
msg2 db 10,13,'NUMBER OF a: $'
cdata ends
ccode segment para 'code'
assume cs:ccode,ds:cdata,ss:cstack
main:
mov ax,cdata
mov ds,ax
mov ah,09h
lea dx,msg1
int 21h
mov cl,0
mov bl,30h
input:
mov ah,01
int 21h
inc cl
cmp al,61h
je incre
cmp cl,9
je incre
jmp input
incre:
inc bl
cmp cl,9
jne input
mov ah,09h
lea dx,msg2
int 21h
mov ah,02h
mov dh,bl
int 21h
mov ah, 4ch
int 21h
ccode ends
end main
ENTER 9 CHARACTERS:aaadfasfg
NUMBER OF a: ¶
ENTER 9 CHARACTERS:fffffffff
NUMBER OF a: ¶
ENTER 9 CHARACTERS:dasdawdaf
NUMBER OF a: ¶
You've got a typo in your code:
mov ah,02h
mov dh,bl <-- HERE
int 21h
The character should be placed in dl, not in dh.
Another problem is that you're incrementing bl one time too many:
cmp al,61h
je incre
cmp cl,9
je incre <-- Wrong. al didn't equal 'a', so we shouldn't jump to incre.
jmp input
That should be changed to something like:
cmp al,61h
je incre
cmp cl,9
je done ; We're done. Jump past the end of the loop without incrementing bl
jmp input
incre:
inc bl
cmp cl,9
jne input
done:
Or even simpler:
cmp al,61h
jne no_inc
inc bl
no_inc:
cmp cl,9
jne input