Question

汇编什么是前导字符和后续字符，

Answer 1

.model small
.386
.code
MAIN PROC FAR
start:
push ds
sub ax,ax
push ax
input:
mov ah,7H
int 21H
cmpe:
cmp al,20H
JE exit
cmp al,61H
JL input
cmp al,7AH
JG input
print:
sub al,01H
mov dl,al
mov ah,02H
int 21H
add al,01H
mov dl,al
mov ah,02H
int 21H
add al,01H
mov dl,al
mov ah,02H
int 21H
;输出换行回车
mov dl,0AH
mov ah,02H
int 21H
jmp input
exit :
ret
MAIN ENDP
END start