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

1 vote281 views1 answer
Include guard c++
C++
0 vote284 views1 answer
Vector of shared_ptr c++ push_back
C++
0 vote275 views1 answer
C++ conditional typedef
C++
0 vote280 views1 answer
Print octal number in c++
C++
2 votes281 views1 answer
Clrscr in cpp
C++
0 vote290 views1 answer
Adding variables c++
C++
0 vote289 views1 answer
Namespace "std" n'a pas de membre "filesystem"
C++
0 vote294 views1 answer
Get spaces in cin c++
C++
1 vote281 views1 answer
How to make sure the user inputs a int and not anything else c++
C++
0 vote295 views1 answer
How to find the left most bit 1 in binary of any number
C++