b) Write a procedure named str_remove2 that removes n characters from a string. Pass an integer specifying the position in the string from where the characters are to be removed. Pass an integer specifying the number of characters to remove. The following

is an example implementation of the str_remove2 procedure in Python:

def str_remove2(string, pos, n):
    # check if pos is within the bounds of the string
    if pos < 0 or pos >= len(string):
        return string
    
    # remove n characters from the specified position
    return string[:pos] + string[pos+n:]

Here's how you can use the `str_remove2` procedure:

string = "Hello, World!"
new_string = str_remove2(string, 7, 6)
print(new_string) # output: "Hello!"

In the example above, we remove 6 characters starting from position 7 in the string "Hello, World!", resulting in the new string "Hello!".

相关问题

2) Str_remove Procedure a) Write a procedure named str_remove1 that removes n characters from a string. Pass a pointer to the position in the string where the characters are to be removed. Pass an integer specifying the number of characters to remove. The following code, for example, shows how to remove “xxxx” from target: .data target BYTE "abcxxxxdefghijklmop",0 .code INVOKE str_remove1, ADDR [target+3], 4 b) Write a procedure named str_remove2 that removes n characters from a string. Pass an integer specifying the position in the string from where the characters are to be removed. Pass an integer specifying the number of characters to remove. The following code, for example, shows how to remove “xxxx” from target: .data target BYTE "abcxxxxdefghijklmop",0 .code INVOKE str_remove2, ADDR target, 4, 4 c) Write a procedure named main that tests str_remove1 and str_remove2 using several different arguments and displays the strings before and after removing characters.

Here's an implementation of the `str_remove1`, `str_remove2`, and `main` procedures in x86 assembly language using the Irvine32 library:

include Irvine32.inc

; str_remove1 - Removes n characters from a string starting at a specified pointer
; Input: ESI = pointer to string
;        ECX = number of characters to remove
str_remove1 PROC
    push ebx
    push ecx
    mov ebx, esi        ; save pointer to string in EBX
    add esi, ecx        ; move pointer to end of characters to remove
    mov cl, [esi]       ; get next character after characters to remove
str_remove1_loop:
    mov al, [esi+1]     ; copy character after current character to current position
    mov [esi], al
    inc esi
    cmp al, 0           ; check for end of string
    jne str_remove1_loop ; repeat until end of string is reached
    sub esi, ecx        ; move pointer back to start of removed characters
    mov byte ptr [esi], cl  ; add null terminator at end of new string
    mov esi, ebx        ; restore pointer to original string
    pop ecx
    pop ebx
    ret
str_remove1 ENDP

; str_remove2 - Removes n characters from a string starting at a specified position
; Input: ESI = pointer to string
;        EDX = starting position
;        ECX = number of characters to remove
str_remove2 PROC
    push ebx
    push ecx
    mov ebx, esi        ; save pointer to string in EBX
    add esi, edx        ; move pointer to starting position
    add esi, ecx        ; move pointer to end of characters to remove
    mov cl, [esi]       ; get next character after characters to remove
str_remove2_loop:
    mov al, [esi+1]     ; copy character after current character to current position
    mov [esi], al
    inc esi
    cmp al, 0           ; check for end of string
    jne str_remove2_loop ; repeat until end of string is reached
    sub esi, ecx        ; move pointer back to start of removed characters
    mov byte ptr [esi], cl  ; add null terminator at end of new string
    mov esi, ebx        ; restore pointer to original string
    pop ecx
    pop ebx
    ret
str_remove2 ENDP

main PROC
    ; Example usage of str_remove1
    mov esi, OFFSET target
    INVOKE str_remove1, esi+3, 4
    mov edx, OFFSET target
    call WriteString
    mov edx, OFFSET crlf
    call WriteString
    
    ; Example usage of str_remove2
    mov esi, OFFSET target
    INVOKE str_remove2, esi, 3, 4
    mov edx, OFFSET target
    call WriteString
    mov edx, OFFSET crlf
    call WriteString
    
    ; Test with different arguments
    mov esi, OFFSET target
    INVOKE str_remove1, esi+7, 4
    mov edx, OFFSET target
    call WriteString
    mov edx, OFFSET crlf
    call WriteString
    
    mov esi, OFFSET target
    INVOKE str_remove2, esi, 11, 6
    mov edx, OFFSET target
    call WriteString
    mov edx, OFFSET crlf
    call WriteString
    
    EXIT
main ENDP

.data
    target BYTE "abcxxxxdefghijklmop",0
    crlf BYTE 0dh, 0ah, 0

In the `main` procedure, we first demonstrate the usage of `str_remove1` and `str_remove2` to remove the "xxxx" substring from the `target` string. We then test the procedures with different arguments and display the strings before and after removing characters.

Write a procedure named str_remove1 that removes n characters from a string. Pass a pointer to the position in the string where the characters are to be removed. Pass an integer specifying the number of characters to remove. The following code, for example, shows how to remove “xxxx” from target:.datatarget BYTE "abcxxxxdefghijklmop",0.codeINVOKE str_remove1, ADDR [target+3], 4Write a procedure named str_remove2 that removes n characters from a string. Pass an integer specifying the position in the string from where the characters are to be removed. Pass an integer specifying the number of characters to remove. The following code, for example, shows how to remove “xxxx” from target:.datatarget BYTE "abcxxxxdefghijklmop",0.codeINVOKE str_remove2, ADDR target, 4, 4Write a procedure named main that tests str_remove1 and str_remove2 using several different arguments and displays the strings before and after removing characters.Requirement: Your report needs to include the source code

;-----------------------------------------
; Program: String Remove
; Author: [Your Name]
; Date: [Date]
; Description: This program removes n characters from a string using two different procedures.
;-----------------------------------------

INCLUDE Irvine32.inc

;-----------------------------------------
; Procedure: str_remove1
; Parameters:
; str_ptr - a pointer to the position in the string where the characters are to be removed
; n - the number of characters to remove
; Description: This procedure removes n characters from a string.
;-----------------------------------------
str_remove1 PROC
push ebp
mov ebp, esp
push esi

mov esi, [ebp + 8] ; esi points to the start of the string
add esi, [ebp + 12] ; add the offset to the pointer
mov ecx, [ebp + 16] ; ecx = n
mov edi, esi

rep movsb ; move the rest of the string back n characters

pop esi
pop ebp
ret
str_remove1 ENDP

;-----------------------------------------
; Procedure: str_remove2
; Parameters:
; str_ptr - a pointer to the string
; pos - the position in the string where the characters are to be removed
; n - the number of characters to remove
; Description: This procedure removes n characters from a string.
;-----------------------------------------
str_remove2 PROC
push ebp
mov ebp, esp
push esi

mov esi, [ebp + 8] ; esi points to the start of the string
add esi, [ebp + 12] ; add the offset to the pointer
mov ecx, [ebp + 16] ; ecx = n
add esi, ecx ; move esi to the end of the substring to remove
mov edi, [ebp + 8] ; edi points to the start of the string

rep movsb ; move the rest of the string back n characters

pop esi
pop ebp
ret
str_remove2 ENDP

;-----------------------------------------
; Procedure: main
; Description: This procedure tests str_remove1 and str_remove2 using several different arguments and displays the strings before and after removing characters.
;-----------------------------------------
main PROC
; Test str_remove1
mov esi, OFFSET str1
call WriteString
call Crlf

INVOKE str_remove1, OFFSET str1 + 3, 4

mov esi, OFFSET str1
call WriteString
call Crlf
call Crlf

; Test str_remove2
mov esi, OFFSET str2
call WriteString
call Crlf

INVOKE str_remove2, OFFSET str2, 3, 4

mov esi, OFFSET str2
call WriteString
call Crlf

INVOKE str_remove2, OFFSET str2, 7, 5

mov esi, OFFSET str2
call WriteString
call Crlf

INVOKE str_remove2, OFFSET str2, 0, 3

mov esi, OFFSET str2
call WriteString
call Crlf

exit
main ENDP

.data
str1 BYTE "abcxxxxdefghijklmop",0
str2 BYTE "0123456789",0

.code
start:
call main
exit