C++:map中数据的插入和删除

#pragma warning(disable:4786)

#include <iostream>
#include <string>
#include <map>

using namespace std;

int main()
{
/*
map<int,string> tmp;
map<int,string>::const_iterator iter1,iter2;
tmp.insert(pair<int,string>(54090104,"Bob"));
tmp.insert(pair<int,string>(54090105,"Ben"));
iter1 = tmp.begin();
iter2 = tmp.end();
*/
map<int,string> studentMessage;
map<int,string>::iterator iter;
//向map中插入数据
studentMessage.insert(pair<int,string>(54090101,"Mike"));
studentMessage.insert(pair<int,string>(54090101,"MIKE"));//重复插入
studentMessage.insert(map<int,string>::value_type(54090102,"Sam"));
studentMessage.insert(map<int,string>::value_type(54090102,"SAM"));//重复插入
studentMessage[54090103] = "Jake";
studentMessage[54090103] = "JAKE";//重复插入

//为了测试删除，先插入两个数据,看插入结果主要看上面的插入方式
studentMessage[54090104] = "Bob";
studentMessage[54090105] = "Ben";

cout<<"完成插入后map中的数据："<<endl;
for(iter = studentMessage.begin() ; iter != studentMessage.end() ; ++iter)
{
cout<<iter->first<<" "<<iter->second<<endl;
}

//从map中删除数据
iter = studentMessage.begin();
studentMessage.erase(iter);
cout<<"利用迭代器删除map中第一个元素："<<endl;
for(iter = studentMessage.begin() ; iter != studentMessage.end() ; ++iter)
{
cout<<iter->first<<" "<<iter->second<<endl;
}
studentMessage.erase(54090102);
cout<<"利用键值删除map中的第一个元素："<<endl;
for(iter = studentMessage.begin() ; iter != studentMessage.end() ; ++iter)
{
cout<<iter->first<<" "<<iter->second<<endl;
}
studentMessage.erase(studentMessage.begin(),studentMessage.end());
cout<<"利用范围迭代器删除map中的所有数据："<<endl;
for(iter = studentMessage.begin() ; iter != studentMessage.end() ; ++iter)
{
cout<<iter->first<<" "<<iter->second<<endl;
}
return 0;
}