常用字符串处理方法

读取文件中所有字符，包括空格。

 1 #include <iostream>
 2 #include <string>
 3 #include <fstream>
 4 #include <vector>
 5 #include <algorithm>
 6 
 7 using namespace std;
 8 
 9 int main()
10 {
11     fstream in("d:\\demo.txt");
12     in>>noskipws;
13     char c;
14     vector<int> words;
15     long records=0;
16     long word=0;
17     while(!in.eof())
18     {
19 
20         in >> c;
21         if(in.eof())break;
22         if(c == '\n')continue;
23         if(c == '.')
24         {
25             words.push_back(word);
26             word=0;
27             ++records;
28             continue;
29         }
30         ++word;
31     }
32 
33     in.close();
34     sort(words.begin(),words.end());
35     return 0;
36 }
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字符串分割的方法：

 1 void split(string &str,char c,vector<string> &v)
 2 {
 3     string::iterator begin=str.begin();
 4     long pos1=0;
 5     long pos2=0;
 6     while(begin!=str.end())
 7     {
 8         if(*begin == c)
 9         {
10             string s = str.substr(pos1,pos2);
11             v.push_back(s);
12             pos1=pos2;
13             ++pos1;
14         }
15         ++pos2;
16         ++begin;
17     }
18     if(pos2>pos1)
19     {
20         string s = str.substr(pos1,pos2);
21         v.push_back(s);
22     }
23 }
View Code

 

posted on 2017-08-09 10:17  ^~~^  阅读(157)  评论(0)  编辑  收藏  举报

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