This code doesn't work for me. My goal is to ask user string input, convert to capital letters, and store them one by one in an array, then output the characters(that is in all caps) back to the user. please help me :(
org 100h
mov bl, 0
mov ah, 9
mov dx, input
int 21h
again:
mov ah, 1
int 21h
sub al, 20h
mov [inp+bl], al
inc bl
cmp bl, 2
jle again
loops:
mov bl, 0
mov ah, 2
mov dl, [inp+bl]
int 21h
inc bl
cmp bl, 2
jle loops
mov ax, 4Ch
int 21h
input db 'Input: ',24h
output db 'Output: ',24h
inp db 20 dup(?), 24h
mov [inp+bl], al
The main problem here is that you use an addressing mode that simply does not exist!
You can quickly correct your code if you change every instance of BL into BX.
mov bx, 0
mov ah, 9
mov dx, input
int 21h
again:
mov ah, 1
int 21h
sub al, 20h
mov [inp+bx], al
inc bx
cmp bx, 2
jle again
loops:
mov bx, 0
mov ah, 2
mov dl, [inp+bx]
int 21h
inc bx
cmp bx, 2
jle loops
sub al, 20h
Perhaps you've over-simplified the code because this capitalization will of course only work if the user only types in small caps a..z and nothing else.