C++ primer 习题练习：10.9

#include<string> #include<map> #include<iostream> using namespace std; //显示 void show(const map<string,int> &smap) { for(map<string,int>::const_iterator iter=smap.begin();iter!=smap.end();++iter) { cout<<iter->first<<":"<<iter->second<<endl; } } int main() { map<string,int> word_count; string word; while(cin>>word) { ++word_count[word]; } show(word_count); }