急~~~！！！！好急！！！！

[BBsun]

内容：
编写程序：实现int 21h 的字符串输入输出实现功能：先显示“input:",然后从键盘输入1~20个字符串（最大为 20 个字符）。在下一行显示“output：”和输出字符串。重复上述输入和显示，直到按 ctrl-c才退出

[zuolihua]

data segment
string db 23
input db "input:"
data ends
code segment
assume cs:code ds:data
start:
move ax,data
move ds,ax
circle:
move ah,0ah ;0a还是09显示我忘了,你自己查查
mov dx,offset input
mov [dx],20
int 21h
mov dx, offset input
mov al,09
int 21h
mov al,[dx+1]
mov ah,0
inc dx,ax+2
mov [dx],0ah
mov [dx+1],'$'
mov dx,offset string+2
mov al,0ah
int 21h
jmp circle
code ends
end start

[BBsun]

有好多错哦～～～“哇～～～～～”

[csdsjkk]

sseg segment stack
dw 256 dup (?)
sseg ends

dseg segment
buf db 21,?,21 dup (?)
msg1 db 13,10,'input:',24h
msg2 db 13,10,'output:',24h
dseg ends

cseg segment
assume cs:cseg,ds:dseg,ss:sseg

start:
mov ax,dseg
mov ds,ax
cont:
mov dx,offset msg1
mov ah,9
int 21h
mov dx,offset buf
mov ah,0ah
int 21h
mov si,dx
mov al,[si+1]
mov ah,0
add si,ax
add si,2
mov byte ptr [si],24h
mov dx,offset msg2
mov ah,9
int 21h
mov dx,offset buf + 2
mov ah,9
int 21h
jmp cont

cseg ends
end start