Case Masm
Quick Assembly question before my program is due at 12?
I have my code very close to working correctly, but all that I am getting when I test it is dollar signs.
I wrote a program in assembly to convert user input to all capital letters, ending on a period. Any help with what I am doing wrong to make this program run correctly would be appreciated more than you can imagine.
My code is:
.model small
.8086
.stack 256
.data
str1 db 50 dup('$')
.code
start:
mov ax, @data
mov ds, ax
mov bx, @data
int 21h
lea si, str1
xor cx, cx
upper_case:
mov ah, 01h
int 21h
cmp al, 2Eh
jz done
mov [si], al
; check if it's a lower case letter:
cmp byte ptr [si], 'a'
jb ok
cmp byte ptr [si], 'z'
ja ok
and byte ptr [si], 11011111b
ok:
inc si
inc cx
jne upper_case
stop:
mov ah, 09h
int 21h
lea si, str1
done:
mov dl, [si]
mov ah, 02h
int 21h
inc si
dec cx
jnz done
mov ax, 4C00h
int 21h
space:
end start
I am compiling with DOSbox and MASM.
Thanks!!!!
You need to swap these two lines:
lea si, str1
done:
To become:
done:
lea si, str1
This is because you are trying to print str1 which starts at [si]
==========
Hints:
create a list of allowable characters using db
each allowable character is paired with it's output character.
getch
create a loop to search if character is allowed
then print the paired character instead of the allowed character.
This should shrink your assembly program to alot less lines.
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