lewis_loo
asked on
assembly (string)
Please show me the code which is runable with the following criteria
code the program to input the string, character by character using pop and push, push it one by one in a variable, then pop one by one in another variable (so that it show the reverse of the first string) and have to consider the backspace
if I don't understand your code, can I have your email address so I can ask you if any problem
code the program to input the string, character by character using pop and push, push it one by one in a variable, then pop one by one in another variable (so that it show the reverse of the first string) and have to consider the backspace
if I don't understand your code, can I have your email address so I can ask you if any problem
Jan Louwerens
Is this a school assignment?
ASKER
No, I have doing it by using swaping but it's too long I think I should use push and pop. but I don't know how to implemented on it?
I can send you my source and if can please improve this source or change to push or pop I think it would better than doing swaping like this
TITLE reverse.asm
DOSSEG
..MODEL SMALL
..STACK 100h
..DATA
msg db "Enter a phrase (not more than 30 characters) : $"
errormsg db "Error, Please input not more than 30 characters$"
temp dw ?
total dw ?
TotalStrLen dw ?
char1 db ?
char2 db ?
NAMEPAR LABEL BYTE
MAXNLEN DB 31
NAMELEN DB ?
NAMEFLD DB 32 DUP(' '),'$'
..CODE
clrscr proc near
; mov ah,6
; mov al,0
; mov bh,7
; mov cx,0
; mov dh,24
; mov dl,79
; int 10h
mov ah,0
mov al,3
int 10h
ret
clrscr endp
prompt proc near
mov dx,offset msg
mov ah,9
int 21h
ret
prompt endp
input proc near
mov ah,0Ah
mov dx,offset NAMEPAR
int 21h
ret
input endp
reverse proc near
mov bh,0
mov bl,namelen
sub bx,1
mov temp,bx
mov TotalStrLen,bx
mov total,bx
shr total,1
up:
mov dl,namefld[bx]
mov char1,dl
mov bx,TotalStrLen
sub bx,temp
mov dl,namefld[bx]
mov bx,temp
mov namefld[bx],dl
mov bx,TotalStrLen
sub bx,temp
mov dl,char1
mov namefld[bx],dl
dec temp
mov bx,temp
dec total
cmp total,0
jge up
ret
reverse endp
moveto proc near
mov ah,2
int 10h
ret
moveto endp
makecenter proc near
mov dl,namelen
shr dl,1
neg dl
add dl,40
mov dh,12
call moveto
ret
makecenter endp
output proc near
mov ah,9
mov dx,offset namefld
int 21h
ret
output endp
readkey proc near
mov ah,8
int 21h
ret
readkey endp
start:
call clrscr
mov ax,@data
mov ds,ax
call prompt
call input
call makecenter
call reverse
call output
call readkey
mov ah,4Ch
int 21h
end start
I can send you my source and if can please improve this source or change to push or pop I think it would better than doing swaping like this
TITLE reverse.asm
DOSSEG
..MODEL SMALL
..STACK 100h
..DATA
msg db "Enter a phrase (not more than 30 characters) : $"
errormsg db "Error, Please input not more than 30 characters$"
temp dw ?
total dw ?
TotalStrLen dw ?
char1 db ?
char2 db ?
NAMEPAR LABEL BYTE
MAXNLEN DB 31
NAMELEN DB ?
NAMEFLD DB 32 DUP(' '),'$'
..CODE
clrscr proc near
; mov ah,6
; mov al,0
; mov bh,7
; mov cx,0
; mov dh,24
; mov dl,79
; int 10h
mov ah,0
mov al,3
int 10h
ret
clrscr endp
prompt proc near
mov dx,offset msg
mov ah,9
int 21h
ret
prompt endp
input proc near
mov ah,0Ah
mov dx,offset NAMEPAR
int 21h
ret
input endp
reverse proc near
mov bh,0
mov bl,namelen
sub bx,1
mov temp,bx
mov TotalStrLen,bx
mov total,bx
shr total,1
up:
mov dl,namefld[bx]
mov char1,dl
mov bx,TotalStrLen
sub bx,temp
mov dl,namefld[bx]
mov bx,temp
mov namefld[bx],dl
mov bx,TotalStrLen
sub bx,temp
mov dl,char1
mov namefld[bx],dl
dec temp
mov bx,temp
dec total
cmp total,0
jge up
ret
reverse endp
moveto proc near
mov ah,2
int 10h
ret
moveto endp
makecenter proc near
mov dl,namelen
shr dl,1
neg dl
add dl,40
mov dh,12
call moveto
ret
makecenter endp
output proc near
mov ah,9
mov dx,offset namefld
int 21h
ret
output endp
readkey proc near
mov ah,8
int 21h
ret
readkey endp
start:
call clrscr
mov ax,@data
mov ds,ax
call prompt
call input
call makecenter
call reverse
call output
call readkey
mov ah,4Ch
int 21h
end start
ASKER
No, I have doing it by using swaping but it's too long I think I should use push and pop. but I don't know how to implemented on it?
I can send you my source and if can please improve this source or change to push or pop I think it would better than doing swaping like this
TITLE reverse.asm
DOSSEG
..MODEL SMALL
..STACK 100h
..DATA
msg db "Enter a phrase (not more than 30 characters) : $"
errormsg db "Error, Please input not more than 30 characters$"
temp dw ?
total dw ?
TotalStrLen dw ?
char1 db ?
char2 db ?
NAMEPAR LABEL BYTE
MAXNLEN DB 31
NAMELEN DB ?
NAMEFLD DB 32 DUP(' '),'$'
..CODE
clrscr proc near
; mov ah,6
; mov al,0
; mov bh,7
; mov cx,0
; mov dh,24
; mov dl,79
; int 10h
mov ah,0
mov al,3
int 10h
ret
clrscr endp
prompt proc near
mov dx,offset msg
mov ah,9
int 21h
ret
prompt endp
input proc near
mov ah,0Ah
mov dx,offset NAMEPAR
int 21h
ret
input endp
reverse proc near
mov bh,0
mov bl,namelen
sub bx,1
mov temp,bx
mov TotalStrLen,bx
mov total,bx
shr total,1
up:
mov dl,namefld[bx]
mov char1,dl
mov bx,TotalStrLen
sub bx,temp
mov dl,namefld[bx]
mov bx,temp
mov namefld[bx],dl
mov bx,TotalStrLen
sub bx,temp
mov dl,char1
mov namefld[bx],dl
dec temp
mov bx,temp
dec total
cmp total,0
jge up
ret
reverse endp
moveto proc near
mov ah,2
int 10h
ret
moveto endp
makecenter proc near
mov dl,namelen
shr dl,1
neg dl
add dl,40
mov dh,12
call moveto
ret
makecenter endp
output proc near
mov ah,9
mov dx,offset namefld
int 21h
ret
output endp
readkey proc near
mov ah,8
int 21h
ret
readkey endp
start:
call clrscr
mov ax,@data
mov ds,ax
call prompt
call input
call makecenter
call reverse
call output
call readkey
mov ah,4Ch
int 21h
end start
I can send you my source and if can please improve this source or change to push or pop I think it would better than doing swaping like this
TITLE reverse.asm
DOSSEG
..MODEL SMALL
..STACK 100h
..DATA
msg db "Enter a phrase (not more than 30 characters) : $"
errormsg db "Error, Please input not more than 30 characters$"
temp dw ?
total dw ?
TotalStrLen dw ?
char1 db ?
char2 db ?
NAMEPAR LABEL BYTE
MAXNLEN DB 31
NAMELEN DB ?
NAMEFLD DB 32 DUP(' '),'$'
..CODE
clrscr proc near
; mov ah,6
; mov al,0
; mov bh,7
; mov cx,0
; mov dh,24
; mov dl,79
; int 10h
mov ah,0
mov al,3
int 10h
ret
clrscr endp
prompt proc near
mov dx,offset msg
mov ah,9
int 21h
ret
prompt endp
input proc near
mov ah,0Ah
mov dx,offset NAMEPAR
int 21h
ret
input endp
reverse proc near
mov bh,0
mov bl,namelen
sub bx,1
mov temp,bx
mov TotalStrLen,bx
mov total,bx
shr total,1
up:
mov dl,namefld[bx]
mov char1,dl
mov bx,TotalStrLen
sub bx,temp
mov dl,namefld[bx]
mov bx,temp
mov namefld[bx],dl
mov bx,TotalStrLen
sub bx,temp
mov dl,char1
mov namefld[bx],dl
dec temp
mov bx,temp
dec total
cmp total,0
jge up
ret
reverse endp
moveto proc near
mov ah,2
int 10h
ret
moveto endp
makecenter proc near
mov dl,namelen
shr dl,1
neg dl
add dl,40
mov dh,12
call moveto
ret
makecenter endp
output proc near
mov ah,9
mov dx,offset namefld
int 21h
ret
output endp
readkey proc near
mov ah,8
int 21h
ret
readkey endp
start:
call clrscr
mov ax,@data
mov ds,ax
call prompt
call input
call makecenter
call reverse
call output
call readkey
mov ah,4Ch
int 21h
end start
ASKER CERTIFIED SOLUTION
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ASKER
What it the 'byte' command use for?
mov byte ptr [XXX], YY
is actually the same as mov [XXX], YY
it's just better to understand when you read the code, so I prefer it
is actually the same as mov [XXX], YY
it's just better to understand when you read the code, so I prefer it