map学习 

 1 #include <map>
 2 #include <iostream>
 3 using namespace std;
 4 int main()
 5 {
 6     map<int ,int >mapm;
 7     mapm.insert(pair<int ,int>(0,200));
 8     mapm.insert(pair<int ,int>(1,300));
 9     mapm.insert(pair<int ,int>(2,400));
10     mapm[3]=500;
11     map<int ,int >::iterator it;
12     for (it=mapm.begin();it!=mapm.end();++it)
13     {
14         cout<<it->first<<"    "<<it->second<<endl;
15     }
16     cout<<"============map的大小============="<<endl;
17     int nsize=mapm.size();
18     cout<<nsize<<endl;
19     cout<<"=========输出=============="<<endl;
20     for (int i=0;i<nsize;++i)
21     {
22         cout<<mapm[i]<<endl;
23     }
24     cout<<"==========================="<<endl;
25     map<int,int>::iterator pos=mapm.find(5);
26     
27     if (pos==mapm.end())
28     {
29 
30         cout<<"====没有发现======"<<endl;
31     }
32     
33 
34 
35 }

 

posted @ 2013-08-20 23:09  cheshulin  阅读(139)  评论(0)    收藏  举报