1 #include <iostream>
 2 #include <vector>
 3 #include <set>
 4 #include <map>
 5 #include <fstream>
 6 #include <sstream>
 7 #include <string>
 8 
 9 using namespace std;
10 
11 int main()
12 {
13     ifstream in;
14     in.open("C:\\Users\\HP\\Desktop\\passage.txt
 
");
15     vector<string>row;                   //使用vector<string>來保存整個輸入文件的一份拷貝，輸入文件的每行保存為其中的每一個元素
16     map<string, set<int>>word_and_row;   //使用map將每個單詞與它出現的行號set關聯起來，使用set可以保證行號不會重復且升序保存
17     string s;
18     while (getline(in, s))
19     {
20         row.push_back(s);
21     }
 
22     for (size_t i = 0; i < row.size(); ++i)
23     {
24         string word;
25         istringstream read(row[i]);     //使用istringstream來將每行分解為單詞
26         while (read >> word)
27             word_and_row[word].insert(i);
28     }
29     
30     string s1;                          //s1為待查找的單詞。註意：待查找的單詞不能與句號或逗號連在一起！
 

31     while (cin >> s1 && s1 != "q" )     //輸入q時終止輸入
32         if (word_and_row.find(s1) != word_and_row.end())
33         {
34             int i = word_and_row[s1].size();
35             cout << s1 << " occurs " << i << " times" << endl;
36             for (auto d : word_and_row[s1])
37                 cout << "(line " << d + 1 << ") " << row[d] << endl;
38             
39         }
40         else
41         {
42             cout << "This word can not be found in this passage! Please input a word again: " << endl;    
43         }
44     in.close();
45 
46     return 0;
47 }

C++Primer筆記——文本查詢程序（原創，未使用類）