如何删除字符串中某个字符后的所有内容?
How do I remove everything after a certain character in a string?
如何删除字符串中“?”之后的所有内容?到目前为止我的代码搜索“?”。我该如何继续?
这是我的代码。
INCLUDE Irvine32.inc
.data
source BYTE "Is this a string? Enter y for yes, and n for no",0
.code
main PROC
mov edi, OFFSET source
mov al, '?' ; search for ?
mov ecx, LENGTHOF source
cld
repne scasb ; repeat while not equal
jnz quit
dec edi ; edi points to ?
end main
你可以替换“?”后面的所有内容由零,所以“?”之后的所有字符已经 "removed" :
INCLUDE Irvine32.inc
.data
source BYTE "Is this a string? Enter y for yes, and n for no",0
.code
main PROC
mov edi, OFFSET source
mov al, '?' ; search for ?
mov ecx, LENGTHOF source
cld
repne scasb ; repeat while not equal
jnz quit
dec edi ; edi points to ?
;REPLACE ALL CHARACTERS BY "AL" (ZERO) STARTING WHERE "EDI" WAS AND
;FINISH WHEN "ECX" == 0.
mov al, 0 ;<=====================================
repne stosb ;<=====================================
end main
请注意我们如何使用搜索“?”后 EDI 和 ECX 的值。
如何删除字符串中“?”之后的所有内容?到目前为止我的代码搜索“?”。我该如何继续?
这是我的代码。
INCLUDE Irvine32.inc
.data
source BYTE "Is this a string? Enter y for yes, and n for no",0
.code
main PROC
mov edi, OFFSET source
mov al, '?' ; search for ?
mov ecx, LENGTHOF source
cld
repne scasb ; repeat while not equal
jnz quit
dec edi ; edi points to ?
end main
你可以替换“?”后面的所有内容由零,所以“?”之后的所有字符已经 "removed" :
INCLUDE Irvine32.inc
.data
source BYTE "Is this a string? Enter y for yes, and n for no",0
.code
main PROC
mov edi, OFFSET source
mov al, '?' ; search for ?
mov ecx, LENGTHOF source
cld
repne scasb ; repeat while not equal
jnz quit
dec edi ; edi points to ?
;REPLACE ALL CHARACTERS BY "AL" (ZERO) STARTING WHERE "EDI" WAS AND
;FINISH WHEN "ECX" == 0.
mov al, 0 ;<=====================================
repne stosb ;<=====================================
end main
请注意我们如何使用搜索“?”后 EDI 和 ECX 的值。