(筆記) 如何使用C語言實現split()? (C/C++) (C) (JavaScript)
Abstract
寫過JavaScript或ASP的朋友，應該常常用到split()這個函數，他可以輕易地將string轉成array，C語言並沒有相對應的函數，只有strtok()較為接近，稍微加工後，就可以在C語言實現split()。
Introduction
使用環境 : IE 7.0 + Visual Studio 2008
在JavaScript，可以輕易的將string轉成array。
split.htm / JavaScript
<!-- <br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->1
<!--
2 (C) OOMusou 2009 http://oomusou.cnblogs.com
3
4 Filename : split.htm
5 Compiler : IE 7.0
6 Description : javaScript's split()
7 Release : 05/09/2009
8 -->
9 <! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
10 < html xmlns ="http://www.w3.org/1999/xhtml" >
11 < head >
12 < script language ="javascript" type ="text/javascript" >
13 function Button1_onclick() {
14 str = " 10,20,30 " ;
15 arr = str.split( " , " );
16
17 for (i = 0 ; i < 3 ; i ++ )
18 document.getElementById( " div1 " ).innerHTML += arr[i] + " <br> " ;
19 }
20 </ script >
21 </ head >
22 < body >
23 < input id ="Button1" type ="button" value ="button" onclick ="return Button1_onclick()" />
24 < div id ="div1" >
25 </ div >
26 </ body >
27 </ html >
2 (C) OOMusou 2009 http://oomusou.cnblogs.com
3
4 Filename : split.htm
5 Compiler : IE 7.0
6 Description : javaScript's split()
7 Release : 05/09/2009
8 -->
9 <! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
10 < html xmlns ="http://www.w3.org/1999/xhtml" >
11 < head >
12 < script language ="javascript" type ="text/javascript" >
13 function Button1_onclick() {
14 str = " 10,20,30 " ;
15 arr = str.split( " , " );
16
17 for (i = 0 ; i < 3 ; i ++ )
18 document.getElementById( " div1 " ).innerHTML += arr[i] + " <br> " ;
19 }
20 </ script >
21 </ head >
22 < body >
23 < input id ="Button1" type ="button" value ="button" onclick ="return Button1_onclick()" />
24 < div id ="div1" >
25 </ div >
26 </ body >
27 </ html >
split.c / C
<!-- <br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />-->1
/*
2 (C) OOMusou 2009 http://oomusou.cnblogs.com
3
4 Filename : split.c
5 Compiler : Visual C++ 9.0
6 Description : Demo how to implement split() in C
7 Release : 05/09/2009 1.0
8 */
9
10 #include < stdio.h >
11 #include < string .h >
12
13 void split( char ** arr, char * str, const char * del) {
14 char * s = strtok(str, del);
15
16 while (s != NULL) {
17 * arr ++ = s;
18 s = strtok(NULL, del);
19 }
20 }
21
22 int main() {
23 char * str = " 10,20,30 " ;
24 char * arr[ 3 ];
25 const char * del = " , " ;
26 int i = 0 ;
27 split(arr, str, del);
28
29 while (i < 3 )
30 printf( " %s\n " , * (arr + i ++ ));
31 }
2 (C) OOMusou 2009 http://oomusou.cnblogs.com
3
4 Filename : split.c
5 Compiler : Visual C++ 9.0
6 Description : Demo how to implement split() in C
7 Release : 05/09/2009 1.0
8 */
9
10 #include < stdio.h >
11 #include < string .h >
12
13 void split( char ** arr, char * str, const char * del) {
14 char * s = strtok(str, del);
15
16 while (s != NULL) {
17 * arr ++ = s;
18 s = strtok(NULL, del);
19 }
20 }
21
22 int main() {
23 char * str = " 10,20,30 " ;
24 char * arr[ 3 ];
25 const char * del = " , " ;
26 int i = 0 ;
27 split(arr, str, del);
28
29 while (i < 3 )
30 printf( " %s\n " , * (arr + i ++ ));
31 }
執行結果
將strtok()稍微加工，將結果塞到array中，就跟JavaScript的split()一模一樣了。
完整程式碼下載
split_javascript.7z
(JavaScript)
split_c.7z
(C)
See Also
(原創) 如何使用Verilog實現split()? (SOC) (Verilog PLI)
http://www.cnblogs.com/oomusou/archive/2009/05/09/c_split.html