C++ STL map容器的说明测试1

// maptest.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"

/************************************************************************
*
* Map的特点: 1、存储Key-value对
* 2、支持快速查找，查找的复杂度基本是Log(N)
* 3、快速插入，快速删除，快速修改记
*
/************************************************************************/
#include <iostream>
#include <string>
#include <map>
using namespace std;

int main()
{
map<const char*,int> m;
m["a"]=1;
m["b"]=6;
m["c"]=9;
map<const char*,int>::iterator it;
it=m.begin();
const char* c =it->first;
cout<<"first element is :"<<c<<endl;
int i = m["c"];
while(it!=m.end()){
cout << it->first<<";"<<it->second<<endl;
++it;
}
cout <<"m["c"]="<<i<<endl;
cout <<"sizeof m:"<<m.size()<<endl;
cout <<"erase m["c"](1:succ 0:failed):"<<m.erase("c")<<endl;
cout <<"erase m["c"]:"<<m.erase("c")<<endl;
cout <<"sizeof m:"<<m.size()<<endl;
cout<<"m[c]="<<m["c"]<<endl;
cout<<"sizeof m :"<<m.size()<<endl;

cout<<"-----------------"<<endl;
it=m.begin();
while(it!=m.end()){
cout << it->first<<";"<<it->second<<endl;
++it;
}
return 0;

}

运行结果：