C++ iterate map

How to iterate through a map in c++

//traditional way (long)
for(map<string,int>::iterator it=m.begin(); it!=m.end(); ++it)
	if(it->second)cout<<it->first<<" ";
//easy way(short) just works with c++11 or later versions
for(auto &x:m)
	if(x.second)cout<<x.first<<" ";
//condition is just an example of use

C++ map iterator

#include <iostream>
#include <map>
 
int main() {
  std::map<int, float> num_map;
  // calls a_map.begin() and a_map.end()
  for (auto it = num_map.begin(); it != num_map.end(); ++it) {
    std::cout << it->first << ", " << it->second << '\n';
  }
}

Source: en.cppreference.com

Cpp goiver all the map values

map<string, int>::iterator it;

for (it = symbolTable.begin(); it != symbolTable.end(); it++)
{
    std::cout << it->first    // string (key)
              << ':'
              << it->second   // string's value 
              << std::endl;
}

Source: stackoverflow.com

Cpp map iterate over keys

#include <iostream>
#include <map>

int main()
{
    std::map<std::string, int> myMap;

    myMap["one"] = 1;
    myMap["two"] = 2;
    myMap["three"] = 3;

    for ( const auto &myPair : myMap ) {
        std::cout << myPair.first << "\n";
    }
}

Source: stackoverflow.com

C++ iterate map

// C++11 and onwards
for (auto const& keyValue : map)
{
  keyValue.first; // Key
  keyValue.second; // Value
}

Similar codes

0 vote324 views1 answer
C++ rename function
C++
14 votes305 views1 answer
Dynamically generating 2d array in cpp
C++
0 vote353 views1 answer
For_each c++
C++
0 vote343 views2 answers
Memory leak in cpp
C++
4 votes346 views3 answers
REFERENCE C++
C++
1 vote346 views4 answers
Return function in cpp
C++
0 vote360 views1 answer
Structure of s void function
C++
0 vote351 views1 answer
How to merge string array in C++
C++
1 vote348 views2 answers
Ue4 c++ enumaeration
C++
0 vote305 views1 answer
Converting a for loop to a while loop C++
C++