C++程序遍历字典

<container_type> :: iterator iterator_name;

#include <iostream>
#include <iterator>
#include <vector>

using namespace std;

int main(){
   //we are using a vector to demonstrate the working of an iterator
   vector<int> myVec = { 10, 20, 30, 40, 50 };
     
   // creating an iterator
   vector<int>::iterator it;
     
   // iterating through the elements
   cout << "The elements are: ";
   //the begin and end are used to define the range
   for (it = myVec.begin(); it < myVec.end(); it++)
      cout << *it << " ";
     
   return 0;   
}

The elements are: 10 20 30 40 50

map<datatype, datatype> mmap;
for (auto itr = my.begin(); itr != mmap.end(); ++itr) {
   cout << itr->first << ": " << itr->second << endl;
}

#include <iostream>
#include <map>

using namespace std;

int main() {
   //initialising the map
   map <string, string> mmap = {{"City", "London"}, {"Country", "UK"}, {"Continent", "Europe"}};

   //iterating through the contents
   for (auto itr = mmap.begin(); itr != mmap.end(); ++itr) {
      cout << itr->first << ": " << itr->second << endl;
   }
   return 0;
}

City: London
Continent: Europe
Country: UK