Loop through map c++

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

Through map c++

//Since c++17
for (auto& [key, value]: myMap) {
    cout << key << " has value " << value << endl;
}
//Since c++11
for (auto& kv : myMap) {
    cout << kv.first << " has value " << kv.second << endl;
}

Loop through map c++

for (auto i = myMap.begin(); i != myMap.end(); ++i) {
  cout << i->first << ": " << i->second << endl;
  
}

C++ iterate map

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

Similar codes

1 vote312 views1 answer
Check if intent has extras
C++
0 vote294 views1 answer
C++ print to standard error
C++
0 vote334 views1 answer
C++ initialize size of 3d vector
C++
0 vote318 views1 answer
C++ CHEAT SHEAT
C++
0 vote309 views1 answer
Google test assert throw
C++
5 votes322 views3 answers
C++ remove space from string
C++
3 votes314 views1 answer
Abs c++
C++
0 vote324 views7 answers
Hexo
C++
0 vote284 views1 answer
Prefix using stack
C++
0 vote294 views1 answer
Cuda allocate memory
C++