map<k,v>::iterator iter = m.begin();......

1 map<string, int> word_count; // empty
2 // insert default initialized element with key "SK"; then assign 1 to its value
3 word_count["SK"] = 1;

 1 /*==================================================================*\
 2  *
 3  *                    C++ map 运用---统计单词出现的次数
 4  *
 5  *                       2013/6/7 by 樊列龙
 6  *
 7 \*==================================================================*/
 8 
 9 #include <iostream>
10 #include <cstdlib>
11 #include <string>
12 #include <map>
13 
14 using namespace std;
15 
16 int main()
17 {
18     map<string,int> word_count;// empty
19 
20     string word;
21 
22     while(cin >> word)
23     {
24         ++word_count[word];                      // 用下标访问
25     }
26 
27     map<string, int>::iterator iter;             // iter 为pair 类型(value_type)
28     
29     for(iter = word_count.begin(); iter != word_count.end(); iter++)
30     {
31         cout << "[" << iter->first << "] = " << iter->second << endl;
32     }
33 
34     return EXIT_SUCCESS;
35 }

fan
lie
long
SK
love
SK
a
b
c
a
a
b
^Z
[SK] = 2
[a] = 3
[b] = 2
[c] = 1
[fan] = 1
[lie] = 1
[long] = 1
[love] = 1