C++ map loop via while statement

#include <iostream> 
 #include <map> 
 #include <vector> 

using namespace std; 

 int main() //ww w  .  ja v a  2 s .co  m
 { 
    // Iterating through a map 
    map<string, int> NumberWords; 

    NumberWords["ten"] = 10; 
    NumberWords["twenty"] = 20; 
    NumberWords["thirty"] = 30; 

    map<string, int>::iterator loopy = NumberWords.begin(); 

    while (loopy != NumberWords.end()) 
    { 
        cout << loopy->first << " "; 
        cout << loopy->second << endl; 
        loopy++; 
    } 

    // Iterating through a vector 
    vector<string> Words; 

    Words.push_back("hello"); 
    Words.push_back("there"); 
    Words.push_back("ladies"); 
    Words.push_back("and"); 
    Words.push_back("aliens"); 

    vector<string>::iterator vectorloop = Words.begin(); 

    while (vectorloop != Words.end()) 
    { 
        cout << *vectorloop << endl; 
        vectorloop++; 
    } 

    return 0; 
 }