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map funtion in c++

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Mahendra Jakhar (B20CI021) answered on October 1, 2020 Popularity 10/10 Helpfulness 1/10

answer map funtion in c++

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map funtion in c++

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//begin() – Returns an iterator to the first element in the map.
//end() – Returns an iterator to the theoretical element that follows the last element in the map.
//size() – Returns the number of elements in the map.
//max_size() – Returns the maximum number of elements that the map can hold.
//empty() – Returns whether the map is empty.
//pair insert(keyvalue, mapvalue) – Adds a new element to the map.
//erase(iterator position) – Removes the element at the position pointed by the iterator.
//erase(const g)– Removes the key-value ‘g’ from the map.
//clear() – Removes all the elements from the map

Popularity 10/10 Helpfulness 1/10 Language cpp

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Tags: c++ map

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Contributed on Aug 09 2022

Mahendra Jakhar (B20CI021)

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map in cpp

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#include <map>

// empty map container 
map<int, int> gquiz1; 
  
// insert elements in random order 
gquiz1.insert(pair<int, int>(1, 40));

Popularity 10/10 Helpfulness 3/10 Language cpp

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Tags: c++

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Contributed on Oct 01 2020

Alert Ant

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map in cpp

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#include <map>

int main(){
  //new map
  std::map <int,int> myMap;
  myMap[0] = 1;
  myMap[1] = 2;
  myMap[2] = 3;
  myMap[3] = 4;
}

Popularity 10/10 Helpfulness 3/10 Language cpp

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Tags: c++

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Contributed on Nov 11 2020

Zany Zebra

0 Answers Avg Quality 2/10

Map example cpp

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#include <iostream>
#include <map>
using namespace std;
int main(){
    map <char,int> mp;
    map <char,int> mymap,mymap1;

    //insert elements individually in map with the combination of key value and value of element
    mp.insert(pair<char,int>('a',2));   //key is 'c' and 2 is value.
    mp.insert(pair<char,int>('b',1));
    mp.insert(pair<char,int>('c',43));

    //inserts elements in range using insert() function in map 'mymap'.
    mymap.insert(mp.begin(),mp.end());

    //declaring iterator for map
    map <char,int>::iterator it;

    //using find() function to return reference of element mapped by key 'b'.
    it = mp.find('b');

    //prints key and element's value.
    cout<<"Key and element's value of map are: ";
    cout<<it->first<<" and "<<it->second<<endl;

    //alternative way to insert elements by mapping with their keys.
    mymap1['x'] = 23;
    mymap1['y'] = 21;

    cout<<"Printing element mapped by key 'b' using at() function : "<<mp.at('b')<<endl;

    //swap contents of 2 maps namely mymap and mymap1.
    mymap.swap(mymap1);

    /* prints swapped elements of mymap and mymap1 by iterating all the elements through    
        using   iterator. */
    cout<<"Swapped elements and their keys of mymap are: "<<endl;
    for(it=mymap.begin();it!=mymap.end();it++)
    {
    cout<<it->first<<" "<<it->second<<endl;
    }
    cout<<"Swapped elements and their keys of mymap1 are: "<<endl;
    for(it=mymap1.begin();it!=mymap1.end();it++)
    {
    cout<<it->first<<" "<<it->second<<endl;
    }
    //erases element mapped at 'c'.
    mymap1.erase('c');

    //prints all elements of mymap after erasing element at 'c'.

    cout<<"Elements of mymap1 after erasing element at key 'c' : "<<endl;
    for(it=mymap1.begin();it!=mymap1.end();it++)
    {
    cout<<it->first<<" "<<it->second<<endl;
    }

    //erases elements in range from mymap1
    mymap1.erase(mymap1.begin(),mymap1.end());

    cout<<"As mymap1 is empty so empty() function will return 1 : " << mymap1.empty()<<endl;

    //number of elements with key = 'a' in map mp.
    cout<<"Number of elements with key = 'a' in map mp are : "<<mp.count('a')<<endl;

    //if mp is empty then itmp.empty will return 1 else 0.
    if(mp.empty())
    {
        cout<<"Map is empty"<<endl;
    }
    else
    {
        cout<<"Map is not empty"<<endl;
    }

    return 0;
}

Popularity 9/10 Helpfulness 2/10 Language cpp

Source: www.hackerearth.com

Tags: c++

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Contributed on Dec 26 2023

Distinct Dugong

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map in c++

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map in c++

std::map<key_type, value_type> map_name = {{key1, value1},{key2, value2}, ...};

if {1,1,1,2,2,3,3,3,3,4} then after operation for key1 = 4 value will be 1

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Source: www.programiz.com

Tags: c++

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Contributed on Jul 03 2023

Scary Shark

0 Answers Avg Quality 2/10

map funtion in c++

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