如何使用 DOSBox 中的汇编程序消除字符串中的空格和标点符号? [英] How can I eliminate the spaces and punctuation in a string with an assembly program in DOSBox?
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问题描述
我试过了,但它给了我一个错误:
I tried, but it gives me an error:
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
推荐答案
TASM/MASM/JWASM 需要 END
指令作为汇编文件的最后一行.它看起来像:
TASM/MASM/JWASM expects an END
directive as the last line of the assembly file. It would look like:
;END PROGRAM.
mov ax, 4c00h
int 21h
END
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