从文件中读取单词 [英] Reading Words from File
问题描述
我想从文件中读取行，然后分开单词，这样我就可以对每个单词进行处理。说文本文件readme.txt
包含以下内容：
面对左翼和右翼的批评，布什总统
周二坚称Harriet Miers是美国最高法院最优秀的候选人b $ b候选人，并向保守派保守派保证他的律师...... b $ b他的律师......
我可以得到一个char * s的输入，这样s =In然后我用s来做
的东西，然后s =the然后我用它做了一些事情，
等。不知道任何字符串或行或空格的长度。
这是我到目前为止所拥有的。
#include< ctype.h>
#include< stdio.h>
#include< stdlib。 h>
#include< string.h>
void process（char * s）/ *这里有什么不重要*
{
printf（"％s"，s）;
}
int main（）{
char buffer [80];
FILE * f = fopen（" readme.txt"，" r"）;
char * s;
while（fgets（buffer，sizeof（buffer），f）！= NULL）/ *读一行* /
{
while（sscanf（buffer，"％s"，s））/ *扫描行中的单词* /
{
过程; / *做单词* /
}
}
fclose（f）;
返回0;
}
另外，无论如何都要调整缓冲区的大小或重新分配
内存因此它不会溢出并出现seg错误。
I want to read in lines from a file and then seperate the words so i
can do a process on each of the words. Say the text file "readme.txt"
contains the following:
In the face of criticism from the left and right, President Bush
insisted Tuesday that Harriet Miers is the nation''s best-qualified
candidate for the Supreme Court and assured skeptical conservatives
that his lawyer...
I could get an input to a char *s such that s = "In" and then i do
something with s, then s = "the" and then i do something with that,
etc. With no idea the length of any string or line or whitespace.
Heres what I have so far.
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void process(char *s) /* whats here is not really important *
{
printf("%s", s);
}
int main() {
char buffer[80];
FILE *f = fopen("readme.txt", "r");
char *s;
while( fgets(buffer, sizeof(buffer), f) != NULL ) /* reads a line */
{
while( sscanf(buffer, "%s", s) ) /* scans for words in line */
{
process(s); /* do stuff to the words */
}
}
fclose(f);
return 0;
}
Also, is there anyway to adjust the size of the buffer or reallocate
the memory so it doesn''t overflow and get a seg error.
推荐答案
" dough" < 6 **** @ gmail.com>在消息中写道
news：11 ********************* @ f14g2000cwb.googlegro ups.com ...
"dough" <vi****@gmail.com> wrote in message
news:11*********************@f14g2000cwb.googlegro ups.com...
我想从文件中读取行，然后分开单词，这样我就可以对每个单词进行处理。说文本文件readme.txt
包含以下内容：
面对来自左翼和右翼的批评，布什总统周二坚称Harriet Miers是国家最高法院最合格的候选人和保守派保守派保证他的律师......
我可以得到一个char * s的输入s =In然后我用s做某事，然后s =the然后我做了一些事情，
等。不知道任何字符串或行或空格的长度。
I want to read in lines from a file and then seperate the words so i
can do a process on each of the words. Say the text file "readme.txt"
contains the following:
In the face of criticism from the left and right, President Bush
insisted Tuesday that Harriet Miers is the nation''s best-qualified
candidate for the Supreme Court and assured skeptical conservatives
that his lawyer...
I could get an input to a char *s such that s = "In" and then i do
something with s, then s = "the" and then i do something with that,
etc. With no idea the length of any string or line or whitespace.
我不想是苛刻的，但在我看来第2段是关于主题
并且不明智的海报寻求帮助...
亚历克斯
I don''t want to be harsh, but it seems to me the 2nd paragraph is off topic
and unwise for a poster looking for help...
Alex
在文章< 11 ********************* @ f14g2000cwb.googlegroups中。 com>，
dough< vi **** @ gmail.com>写道：
：我想从文件中读取行，然后分开单词，这样我就可以对每个单词进行处理。
在决定
a" word"时，通常会有一个非平凡的语义问题。就是这样的事情。例如，在
哦！中。他大喊（进入他的Hello-Kitty手机。）
然后，如果你按空格划分，你会得到单词例如
哦！，和（进入和电话）和Hello-Kitty
这通常不是你想要的细分。
-
这些.signatures按体积销售，而不是按重量销售。
In article <11*********************@f14g2000cwb.googlegroups. com>,
dough <vi****@gmail.com> wrote:
:I want to read in lines from a file and then seperate the words so i
:can do a process on each of the words.
There is often a non-trivial semantic problem in deciding what
a "word" is in such matters. For example, in
"Oh!," he yelled (into his Hello-Kitty phone.)
then if you go by whitespace you get "words" such as
"Oh!," and (into and phone.) and Hello-Kitty
which is usually not the breakdown you want.
--
These .signatures are sold by volume, and not by weight.
dough写道于10/04/05 14： 39，：
dough wrote On 10/04/05 14:39,:
我想从文件中读取行，然后分开单词，这样我就可以对每个单词进行处理。说文本文件readme.txt
包含以下内容：
面对来自左翼和右翼的批评，布什总统周二坚称Harriet Miers是国家最高法院最合格的候选人和保守派保守派保证他的律师......
我可以得到一个char * s的输入s =In然后我用s做某事，然后s =the然后我做了一些事情，
等。不知道任何字符串或行或空格的长度。
到目前为止我所拥有的。
#include< ctype.h>
#include< stdio.h>
#include< stdlib.h>
#include< string.h>
void process（char * s）/ *这里什么不重要*
{
printf（"％s"，s）;
}
int main（）{
char buffer [80];
FILE * f = fopen（" readme.txt"，" r"）;
char * s ;
在
继续之前测试`f == NULL''是个好主意...
while（ fgets（buffer，sizeof（buffer），f）！= NULL）/ *读取一行* /
{while（sscanf（buffer，"％s"，s））/ *扫描行中的单词* /
这里有一个问题：`s''没有指向任何东西，所以
当scanf（）找到一个单词，并试图将其复制到
记忆中的点，可以随之发生各种恶作剧。
{
process（s）; / *做的话* /
}
}
fclose（f）;
返回0;
}
另外，无论如何都要调整缓冲区的大小或重新分配内存，这样它就不会溢出并出现seg错误。
I want to read in lines from a file and then seperate the words so i
can do a process on each of the words. Say the text file "readme.txt"
contains the following:
In the face of criticism from the left and right, President Bush
insisted Tuesday that Harriet Miers is the nation''s best-qualified
candidate for the Supreme Court and assured skeptical conservatives
that his lawyer...
I could get an input to a char *s such that s = "In" and then i do
something with s, then s = "the" and then i do something with that,
etc. With no idea the length of any string or line or whitespace.
Heres what I have so far.
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void process(char *s) /* whats here is not really important *
{
printf("%s", s);
}
int main() {
char buffer[80];
FILE *f = fopen("readme.txt", "r");
char *s;
It would be a good idea to test `f == NULL'' before
proceeding ...
while( fgets(buffer, sizeof(buffer), f) != NULL ) /* reads a line */
{
while( sscanf(buffer, "%s", s) ) /* scans for words in line */
Here''s a problem: `s'' doesn''t point to anything, so
when scanf() locates a word and tries to copy it to the
memory `s'' points at, all manner of mischief can ensue.
{
process(s); /* do stuff to the words */
}
}
fclose(f);
return 0;
}
Also, is there anyway to adjust the size of the buffer or reallocate
the memory so it doesn''t overflow and get a seg error.
如果你使用malloc（）为`buffer''创建空间，你可以使用realloc（）来放大它。但眼前的问题
不是'缓冲''的大小，而是未初始化的's''。
您的整体任务听起来像是一份工作备受诟病的
strtok（）函数。但是，请参阅Walter Roberson的帖子
使用简单的字符串抨击来分离
" words"来自周围的环境。
-
Er **** *****@sun.com
If you used malloc() to create the space for `buffer'', you
could use realloc() to enlarge it. But the immediate problem
is not the size of `buffer'', but the uninitialized `s''.
Your overall task sounds like a job for the much-maligned
strtok() function. However, see Walter Roberson''s post for
some of the pitfalls of using simple string-bashing to separate
"words" from their surroundings.
--
Er*********@sun.com
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