C++标准库里面没有像java的String类中提供的字符分割函数split ,着实不方便。
1.简洁高效的方法(不过只能包含一个分隔符):
1 #include <vector>
2 #include <string>
3 #include <iostream>
4 using namespace std;
5
6 void SplitString(const string& s, vector<string>& v, const string& c)
7 {
8 string::size_type pos1, pos2;
9 pos2 = s.find(c);
10 pos1 = 0;
11 while(string::npos != pos2)
12 {
13 v.push_back(s.substr(pos1, pos2-pos1));
14
15 pos1 = pos2 + c.size();
16 pos2 = s.find(c, pos1);
17 }
18 if(pos1 != s.length())
19 v.push_back(s.substr(pos1));
20 }
21
22 int main(){
23 string s = "a,b,c,d,e,f";
24 vector<string> v;
25 SplitString(s, v,","); //可按多个字符来分隔;
26 for(vector<string>::size_type i = 0; i != v.size(); ++i)
27 cout << v[i] << " ";
28 cout << endl;
29 //输出: a b c d e f
30 }
当处理有空格的字符串时,还是很有用的!!
2.可包含多个分隔符的实现方式
1 #include <vector>
2 #include <string>
3 #include <iostream>
4 using namespace std;
5
6 vector<string> split(const string &s, const string &seperator){
7 vector<string> result;
8 typedef string::size_type string_size;
9 string_size i = 0;
10
11 while(i != s.size()){
12 //找到字符串中首个不等于分隔符的字母;
13 int flag = 0;
14 while(i != s.size() && flag == 0){
15 flag = 1;
16 for(string_size x = 0; x < seperator.size(); ++x)
17 if(s[i] == seperator[x]){
18 ++i;
19 flag = 0;
20 break;
21 }
22 }
23
24 //找到又一个分隔符,将两个分隔符之间的字符串取出;
25 flag = 0;
26 string_size j = i;
27 while(j != s.size() && flag == 0){
28 for(string_size x = 0; x < seperator.size(); ++x)
29 if(s[j] == seperator[x]){
30 flag = 1;
31 break;
32 }
33 if(flag == 0)
34 ++j;
35 }
36 if(i != j){
37 result.push_back(s.substr(i, j-i));
38 i = j;
39 }
40 }
41 return result;
42 }
43
44 int main(){
45 // string s = "a,b*c*d,e";
46 string s;
47 getline(cin,s);
48 vector<string> v = split(s, ",*"); //可按多个字符来分隔;
49 for(vector<string>::size_type i = 0; i != v.size(); ++i)
50 cout << v[i] << " ";
51 cout << endl;
52 //输出: a b c d e
53 }
3.用C语言中的strtok 函数来进行分割
1 #include <string.h>
2 #include <stdio.h>
3
4 int main(){
5 char s[] = "a,b*c,d";
6 const char *sep = ",*"; //可按多个字符来分割
7 char *p;
8 p = strtok(s, sep);
9 while(p){
10 printf("%s ", p);
11 p = strtok(NULL, sep);
12 }
13 printf("\n");
14 return 0;
15 }
16 //输出: a b c d
参考博客:C++中String类的字符串分割实现