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 vote200 views10 answers
C++ to python converter online
C++
0 vote185 views1 answer
Hello world cc++
C++
0 vote175 views1 answer
Create new node in tree
C++
0 vote168 views1 answer
Can derived class access base class non-static members without object of the base class
C++
0 vote198 views1 answer
Fast i/o in c++
C++
1 vote214 views3 answers
How to take space separated input in c++
C++
17 votes167 views1 answer
Input a string in c++
C++
0 vote205 views1 answer
Inverse lerp c++
C++
0 vote213 views1 answer
Iteraate through a vector
C++
0 vote191 views1 answer
How to do if command in c++
C++