问题描述
遇到意外的文件结尾
;Program p02.asm
.MODEL small
.stack 100h
.data
source db "STRING,WITH. PUNCTUATION : AND * SPACES!$"
aux db " "
.code
mov ax,@data
mov ds,ax
;REMOVE EVERYTHING BUT UPPERCASE LETTERS.
mov si,offset source ; POINT TO STRING.
mov di,offset aux ; POINT TO AUXILIARY.
L1:
mov al,[ si ] ; get character from source
;CHECK IF END STRING ($).
cmp al,'$'
je finale
;CHECK IF CHAR IS UPPERCASE LETTER.
cmp al,65
jb is_not_a_letter ; CHAR IS LOWER THAN 'A'.
cmp al,90
ja is_not_a_letter ; CHAR IS HIGHER THAN 'Z'.
;copY LETTER TO AUX STRING.
mov [ di ],al
inc di ; POSITION FOR NEXT CHaraCTER.
is_not_a_letter:
inc si ; move to next character
jmp L1
finale:
mov [ di ],al ; '$',NECESSARY TO PRINT.
;PRINT STRING.
mov dx,OFFSET aux
mov ah,9
int 21h
;END PROGRAM.
mov ax,4c00h
int 21h
解决方法
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