C++ map iterator

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

C++ iterate map

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

Similar codes

0 vote184 views1 answer
Cin does not wait for input
C++
0 vote191 views1 answer
Define unicode c++
C++
0 vote205 views1 answer
Vector int initialize with increasing numbers
C++
0 vote182 views1 answer
How to use tostring method in c++
C++
0 vote186 views1 answer
How to find the left most bit 1 in binary of any number
C++
1 vote176 views1 answer
Is C++ useful in 2021
C++
0 vote198 views1 answer
Store arbitrarly large vector of doubles c++
C++
2 votes170 views1 answer
Pointer in c++
C++
0 vote180 views1 answer
C++ add everything in a vector
C++
0 vote194 views1 answer
Why do men drink liquor
C++