c++_map_初探1

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1. 统计单词个数。

#include<iostream>#include<map>using namespace std;int main(int argc, char const *argv[]){    string word="";    map<string,int> word_count;    while(cin>>word)        ++word_count[word];    for(const auto &w:word_count)    cout<<w.first<<"出现了"<<w.second<<"次"<<endl;     return 0;}

这里面的word_count容器被用来统计单词出现的次数。

what is your is what^Zis出现了2次what出现了2次your出现了1次--------------------------------Process exited with return value 0Press any key to continue . . .

2. 利用map统计家庭和孩子

#include<iostream>#include<map>#include<string>#include<vector>using namespace std;void add_family(map<string,vector<string>> &families,const string &family){    if(families.find(family)!=families.end())        families[family]=vector<string>();} void add_child(map<string,vector<string>> &families,const string &family,const string &child){    families[family].push_back(child);}int main(int argc, char const *argv[]){    map<string,vector<string>> families;    add_family(families,"xu");    add_child(families,"xu","yuan");    add_child(families,"xu","yicheng");    add_child(families,"wei","zhuang");//  add_family(families,"wei");    for(auto f:families)    {        cout<<f.first<<"家有:";        for(auto s:f.second)            cout<<s<<" ";        cout<<endl;    }    return 0;}

输出结果：

wei家有:zhuangxu家有:yuan yicheng--------------------------------Process exited with return value 0Press any key to continue . . .

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