how to iterate through a map in c++

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JJSE answered on April 30, 2020 Popularity 9/10 Helpfulness 10/10

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how to iterate through a map in c++

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//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

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Tags: c++ iterate map

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Contributed on Apr 30 2020

JJSE

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loop through map c++

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

Popularity 10/10 Helpfulness 9/10 Language cpp

Source: Grepper

Tags: c++

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Contributed on Jan 09 2022

Selfish Seahorse

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c++ map loop through key value

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#include <iostream>
#include <map>

int main() {
    std::map<std::string, int> myMap;

    myMap["one"] = 1;
    myMap["two"] = 2;
    myMap["three"] = 3;

    for ( const auto &[key, value]: myMap ) {
        std::cout << key << '\n';
    }
}

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Source: stackoverflow.com

Tags: c++

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Contributed on Jan 12 2022

Michael Mainbird

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c++ iterate map

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// C++17 and above
for (auto const& [key, value] : map)
{
  // do something
}

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Tags: c++

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Contributed on Apr 22 2022

Yair Shalom

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c++ iterate map

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

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Tags: c++

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Contributed on Dec 03 2021

DavidPgl

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iterate through map c++

Comment

    for (auto i : m)
        cout << i.first << "   " << i.second
             << endl;

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Tags: c++

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Contributed on Jul 22 2021

Frantic Finch

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looping in map c++

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void output(map<string, int> table)
{
       map<string, int>::iterator it;
       for (it = table.begin(); it != table.end(); it++)
       {
            //How do I access each element?  
       }
}

Popularity 9/10 Helpfulness 3/10 Language cpp

Source: stackoverflow.com

Tags: c++

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Contributed on Oct 13 2022

Hungry Hornet

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how to iterate through a map in c++

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