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 vote132 views1 answer
Labs c++
C++
0 vote99 views1 answer
Glut keyboard input
C++
4 votes162 views1 answer
Deep copy c++
C++
0 vote131 views1 answer
TCA9548 I2CScanner Arduino
C++
8 votes125 views3 answers
C++ min
C++
0 vote128 views1 answer
Vector of vector definaion in c++
C++
1 vote141 views1 answer
C++ delete directory
C++
0 vote125 views1 answer
Remove digit from number c++
C++
0 vote128 views3 answers
C++ Dynamic allocation failing
C++
0 vote124 views1 answer
Factorial using recursion cpp
C++