附加档案： 文件dosbox_003.png（5.722 KB） 写一个NASM，它将：
在一行显示您的姓名。 （使用int 21h，函数9.回车符和换行符分别为0Dh和0Ah。） 在下一行，显示提示（再次使用int 21h，function9）并从键盘读取三个字符（使用int 21h，fcn 1.）将字符存储在适当标记的字节变量中。 打印三个字符，每行一个（根据您的实现方式，使用int 21h，function 9或function 2，您的选择。） 使用NASM组装程序并使用DOSBox执行它。
使用命令提示符进行组装
给出此代码（错误加粗并突出显示行） 我有这些错误
C:\NASM>nasm bal-lab2.asm -o bal-lab2.com
bal-lab2.asm:5: error: attempt to define a local label before any non-local
labels
bal-lab2.asm:5: error: parser: instruction expected
bal-lab2.asm:6: error: attempt to define a local label before any non-local
labels
bal-lab2.asm:6: error: parser: instruction expected
bal-lab2.asm:7: warning: label alone on a line without a colon might be in
error [-w+orphan-labels]
bal-lab2.asm:7: error: attempt to define a local label before any non-local
labels
bal-lab2.asm:17: warning: label alone on a line without a colon might be in
error [-w+orphan-labels]
bal-lab2.asm:18: error: parser: instruction expected
bal-lab2.asm:127: error: symbol `main' redefined
bal-lab2.asm:127: error: parser: instruction expected
bal-lab2.asm:128: error: parser: instruction expected
使用此代码
;ff
;ff
;ff
.model small line ***LINE 5***
.stack 100h ***LINE 6***
.data ***LINE 7***
nameString db 'my name here $' ;replace by your name
prompt1 db 'Enter first character : $' ;ask for character
prompt2 db 'Enter second character : $' ;ask for character
prompt3 db 'Enter third character : $' ;ask for character
character1 DB ? ;memory to store character
character2 DB ? ;memory to store character
character3 DB ? ;memory to store character
.code ***LINE 17**
main proc ***LINE 18***
mov ax,@data ;move data address to ax
mov ds,ax ;move ax to data segment
lea dx , nameString ;move content to dx
mov ah,9 ;ask to print array of string
int 21h
mov dx,10 ;print \n
mov ah,2
int 21h
mov dx,13 ;cursor at first position
mov ah,2
int 21h
lea dx , prompt1 ;if use lea no need to use offset
mov ah,9 ;print prompt
int 21h
;ask for character input
mov ah,1
int 21h
mov character1,al ; move to labled memory
mov dx,10 ;print \n
mov ah,2
int 21h
mov dx,13 ;cursor at first position
mov ah,2
int 21h
lea dx , prompt2 ;if use lea no need to use offset
mov ah,9 ;print prompt
int 21h
;ask for character input
mov ah,1
int 21h
mov character2,al ; move to labled memory
mov dx,10 ;print \n
mov ah,2
int 21h
mov dx,13 ;cursor at first position
mov ah,2
int 21h
lea dx , prompt3 ;if use lea no need to use offset
mov ah,9 ;print prompt
int 21h
;ask for character input
mov ah,1
int 21h
mov character3,al ; move to labled memory
mov dx,10 ;print \n
mov ah,2
int 21h
mov dx,13 ;cursor at first position
mov ah,2
int 21h
mov dl,character1 ;move character value to dl for print
mov ah,2
int 21h
mov dx,10 ;print \n
mov ah,2
int 21h
mov dx,13 ;cursor at first position
mov ah,2
int 21h
mov dl,character2 ;move character value to dl for print
mov ah,2
int 21h
mov dx,10 ;print \n
mov ah,2
int 21h
mov dx,13 ;cursor at first position
mov ah,2
int 21h
mov dl,character3 ;move character value to dl for print
mov ah,2
int 21h
mov ah,4ch
int 21h
main endp ***LINE 127***
end main ***LINE 128***
突出显示错误和线条 我非常感谢任何帮助，我对汇编语言非常陌生
答案 0 :(得分：2)
org 0x100 .data中的所有内容移至文件末尾。 COM文件中不需要的部分。db ?的所有出现更改为db 0 lea都会更改为mov character?的所有实例更改为[character?] 进行这些更改并且您的程序将正常工作，我使用DOSBox 0.74测试它，输出看起来像这样;
my name here Enter first character : R Enter second character : a Enter third character : m R a m
这是您为NASM修改过的程序，并进行了一些个人调整，例如缩短标签
org 256
mov dx, Nme ;move content to dx
mov ah, 9 ;ask to print array of string
int 21h
mov dx, 10 ;print \n
mov ah, 2
int 21h
mov dx, 13 ;cursor at first position
mov ah, 2
int 21h
mov dx, prompt1 ;if use lea no need to use offset
mov ah, 9 ;print prompt
int 21h
mov ah, 1 ;ask for chr input
int 21h
mov [chr1] ,al ; move to labled memory
mov dx, 10 ;print \n
mov ah, 2
int 21h
mov dx, 13 ;cursor at first position
mov ah, 2
int 21h
mov dx , prompt2 ;if use lea no need to use offset
mov ah, 9 ;print prompt
int 21h
mov ah,1 ;ask for chr input
int 21h
mov [chr2], al ; move to labled memory
mov dx, 10 ;print \n
mov ah, 2
int 21h
mov dx, 13 ;cursor at first position
mov ah,2
int 21h
mov dx, prompt3 ;if use lea no need to use offset
mov ah, 9 ;print prompt
int 21h
mov ah, 1
int 21h
mov [chr3], al ; move to labled memory
mov dx, 10 ;print \n
mov ah, 2
int 21h
mov dx, 13 ;cursor at first position
mov ah, 2
int 21h
mov dl, [chr1] ;move chr value to dl for print
mov ah, 2
int 21h
mov dx, 10 ;print \n
mov ah, 2
int 21h
mov dx, 13 ;cursor at first position
mov ah, 2
int 21h
mov dl, [chr2] ;move chr value to dl for print
mov ah, 2
int 21h
mov dx, 10 ;print \n
mov ah, 2
int 21h
mov dx, 13 ;cursor at first position
mov ah, 2
int 21h
mov dl, [chr3] ;move chr value to dl for print
mov ah, 2
int 21h
mov ah,4ch
int 21h
Nme: db 'my name here $' ;replace by your name
prompt1: db 'Enter first chr: $' ;ask for chr
prompt2: db 'Enter second chr: $' ;ask for chr
prompt3: db 'Enter third chr: $' ;ask for chr
chr1: DB 0 ;memory to store chr
chr2: DB 0 ;memory to store chr
chr3: DB 0 ;memory to store chr