c 语言字符处理函数 strtok strstep

最新推荐文章于 2024-03-27 16:23:59 发布

sean_xyz

最新推荐文章于 2024-03-27 16:23:59 发布

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本文通过示例展示了如何使用C语言中的strtok和strsep函数来分割字符串。strtok函数允许指定多个分隔符，并返回由这些分隔符分割的子串；而strsep函数则迭代地分割字符串直到所有部分都被处理。

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strtok 案例

Here is a simple example showing the use of strtok.
#include <string.h>
#include <stddef.h>
...
const char string[] = "words separated by spaces -- and, punctuation!";
const char delimiters[] = " .,;:!-";
char *token, *cp;
...
cp = strdupa (string);
token = strtok (cp, delimiters);
token = strtok (NULL, delimiters);
token = strtok (NULL, delimiters);
token = strtok (NULL, delimiters);
token = strtok (NULL, delimiters);
token = strtok (NULL, delimiters);
token = strtok (NULL, delimiters);
/*

Make writable copy. */
token => "words" */
token => "separated" */
token => "by" */
token => "spaces" */
token => "and" */
token => "punctuation" */
token => NULL */

strstep 使用案例

#include <string.h>
#include <stddef.h>
...
const char string[] = "words separated by spaces -- and, punctuation!";
const char delimiters[] = " .,;:!-";
char *running;
char *token;

strsep (&running, delimiters);
strsep (&running, delimiters);
strsep (&running, delimiters);
strsep (&running, delimiters);
strsep (&running, delimiters);
strsep (&running, delimiters);
strsep (&running, delimiters);
strsep (&running, delimiters);
strsep (&running, delimiters);
strsep (&running, delimiters);
strsep (&running, delimiters);
strsep (&running, delimiters);

=>
"words" */
"separated" */
"by" */
"spaces" */
"" */
"" */
"" */
"and" */
"" */
"punctuation" */
"" */
NULL */