C++:map中数据的插入和删除

#pragma warning(disable:4786)

#include 
#include 
#include 

using namespace std;

int main()
{
    /*
    map tmp;
    map::const_iterator iter1,iter2;
    tmp.insert(pair(54090104,"Bob"));
    tmp.insert(pair(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："<for(iter = studentMessage.begin() ; iter != studentMessage.end() ; ++iter)
    {
        cout<first<<" "<second<//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："<for(iter = studentMessage.begin() ; iter != studentMessage.end() ; ++iter)
    {
        cout<first<<" "<second<54090102);
    cout<<"利用键值删除map中的第一个元素："<for(iter = studentMessage.begin() ; iter != studentMessage.end() ; ++iter)
    {
        cout<first<<" "<second<cout<<"利用范围迭代器删除map中的所有数据："<for(iter = studentMessage.begin() ; iter != studentMessage.end() ; ++iter)
    {
        cout<first<<" "<second<return 0;
}