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該程序?qū)崿F(xiàn)了將一個(gè)字符串開頭和結(jié)尾的任意多個(gè)空格去除然后顯示字符串內(nèi)容。
可以根據(jù)需要輸入不同的字符串，程序?qū)⒆詣?dòng)識(shí)別并刪除開頭和結(jié)尾的空格。
適合本科階段學(xué)習(xí)微機(jī)原理與接口技術(shù)的同學(xué)練習(xí)參考。
- ;Remove spaces at the beginning and end of a string
- DATA SEGMENT
- string DB ' a string for testing. ',0
- length DW $-string ;length of the string
- DATA ENDS
- CODE SEGMENT
- ASSUME CS:CODE, DS:DATA
- START:
- MOV AX, DATA
- MOV DS, AX
-
- LEA SI, string
-
- BEGIN: ;Set beginning pointer of the new string
- CMP [SI], ' ' ;Find spaces, skip them
- JNE NEXT
- INC SI
- JMP BEGIN
- NEXT: ;Shift DI to the end of the initial string
- LEA DI, string
- MOV AX, length ;Load length of the string to AX
- ADD DI, AX
- SUB DI, 2 ;Move DI to the end of the string
-
- THIRD: ;Shift DI to the end of the new string
- CMP [DI], ' '
- JNE LAST
- DEC DI
- JMP THIRD
-
- LAST: ;display the new string on screen
- INC DI
- MOV byte ptr[DI], '0' ;string ends with 0
- INC DI
- MOV byte ptr[DI], '
-
- MOV AH, 09H
- MOV DX, SI ;Set offset adress
- INT 21H
-
- CODE ENDS
- END START
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