#include <string> #include <iostream> #include <list> #include <vector> #include <set> #include <map> #include <fstream> using namespace std; void print(const multimap<string,string> &); //程序作用：統計一些作者出版的書籍 int main(int argc,char **argv) { ifstream in(argv[1]); multimap<string,string> author; multiset<string> s1; string str_key,str_value; while(in >> str_key && in >> str_value){//multimap的insert的返回類型是 指向map元素（pair）的一個迭代器multimap<string,string>::iterator pos= author.insert(pair<string,string>{str_key,str_value});cout <<"\tpair first:"<< pos->first << endl;cout << "\tpair second:" << pos->second << endl;} print(author);return 0; } void print(const multimap<string,string> &m) { for(auto i : m){ cout << "author is:"<< i.first << endl;cout << "\t book:" << i.second << endl;}}

執行結果是：
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pair first:robertpair second:c++programpair first:lipingpair second:cprogrampair first:qiaominpair second:c++propair first:qiaoweipair second:cprogram author is:lipingbook:cprogram author is:qiaominbook:c++pro author is:qiaoweibook:cprogram author is:robertbook:c++program

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下面一個程序是統計單詞出現順序的：

#include <string> #include <iostream> #include <list> #include <vector> #include <set> #include <map> #include <fstream> using namespace std; void print(const map<string,size_t> &); void word_count(map<string,size_t> &,const char *); int main(int argc,char **argv) {map<string,size_t> word_cnt; word_count(word_cnt,argv[1]); print(word_cnt);return 0;}//統計單詞出現的次數 void word_count(map<string,size_t> &w,const char *file_name) { string str; ifstream in(file_name); while(in >> str){//下面的3句可以改成1句，具體看下一個程序auto re = w.insert(map<string,size_t>::value_type{str,1}); if(!re.second)++ re.first ->second;} } //打印map對象 void print(const map<string,size_t> &w) { map<string,size_t>::const_iterator it; for(it = w.begin(); it != w.end();++it){cout << "word:" << it->first << " occurs " <<it->second << " times;" << endl;} } #include <string> #include <iostream> #include <list> #include <vector> #include <set> #include <map> #include <fstream> using namespace std; void print(const map<string,size_t> &); void word_count(map<string,size_t> &,const char *); int main(int argc,char **argv) { map<string,size_t> word_cnt; word_count(word_cnt,argv[1]); print(word_cnt);return 0;}void word_count(map<string,size_t> &w,const char *file_name) { string str; ifstream in(file_name); while(in >> str){ //前一個程序這個塊中是3句，現在變成1句了，功能是一樣的++ w.insert({str,0}).first->second;} } void print(const map<string,size_t> &w) { map<string,size_t>::const_iterator it; for(it = w.begin(); it != w.end();++it){cout << "word:" << it->first << " occurs " <<it->second << " times;" << endl;} }

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