Question

我输入的内容如下：

这是,,,, *＆amp;％a ::; demo + String。 +需要** @！///格式::::: !!! this.`

需要输出：

ThisisademoStringNeedtoformatthis

我必须使用 str_trim 执行此操作

编辑：我正在编写加密程序。我必须从字符串中删除所有标点符号，并在加密之前将所有小写字母转换为大写。

我添加了代码。在将其转换为大写之前，我需要删除空格或任何标点符号。到目前为止，我没有在我的书中找到任何可以帮助解决这个问题的内容，除了我们不允许使用的str_trim。

INCLUDE Irvine32.inc .data source byte "This is the source string",0 .code main proc mov esi,0 ; index register mov ecx,SIZEOF source ; loop counter L1: mov al,source[esi] ; get a character from source and source[esi], 11011111b ; convert lower case to upper case inc esi ; move to next character loop L1 ; repeat for entire string mov edx, OFFSET source call WriteString exit main endp end main

Answer 1

您已经尝试从小写更改为大写，所以，我会帮您删除标点符号。下一个代码使用我的建议：将大写字母移动到辅助字符串，忽略标点字符。我用过EMU8086编译器：

.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

我用'$'结束了字符串，因为我用int 21h打印字符串。

如您所见，我没有使用CX也没有使用LOOP指令。我要做的是重复，直到找到'$'。你可以这样做，直到找到0。

Answer 2

这是删除所有标点符号并将其转换为大写后的代码。

INCLUDE Irvine32.inc

.data
source  byte  "STriNG, @# WITH.[][][ lalalala PUncTuATION : AND * SpaceS!", 0
target  byte  SIZEOF source DUP(0), 0                                           

.code
main PROC

    pushad

    mov edx, offset source
    call WriteString
    call CrlF
    mov edx, 0

    mov  esi, offset source 
    mov  edi, offset target      
L1:
    mov  al, [ esi ]          ; get character from source

    cmp  al, 0
    je   final

    cmp  al, 65
    jb   not_letter    ; if char is lower than 'A' jump to not letter
    cmp al, 122
    ja  not_letter     ; if char is greater than 'z' jump to not letter

    cmp al, 90
    ja Label1           ; jump if above 'Z'
    jmp next            ; false
    Label1:
    cmp al, 97
    jl Label2           ; jmp if less than 'a'
    jmp next            ; false
    Label2:             ; if both are true than is greater than 'Z' but less than 'a'
    jmp not_letter      ; jump to not letter

    next:
    mov  [ edi ], al
    inc  di                ; position to next character.

    not_letter:
    inc  si                ; move to next character
    jmp  L1

    final:
    mov  [ edi ], al     

    mov  edx, OFFSET target
    mov  ah, 9
    call WriteString
    call CrlF

    mov  esi,0              ; index register
    mov  ecx,SIZEOF source  ; loop counter
    L2:
    mov  al, target[esi]     ; get a character from source
    and  target[esi], 11011111b     ; convert lower case to upper case
    inc  esi                ; move to next character
    loop L2                 ; repeat for entire string

    mov edx, OFFSET target
    call WriteString
    call CrlF

    popad

  exit
  main endp
  end main

如何删除字符串中的所有标点符号和空格？

2 个答案: