unordered_set find() function in C++ STL

The unordered_set::find() function is a built-in function in C++ STL which is used to search for an element in the container. It returns an iterator to the element, if found else, it returns an iterator pointing to unordered_set::end().

Syntax :

unordered_set_name.find(key)

Parameter: This function accepts a mandatory parameter key which specifies the element to be searched for.



Return Value: It returns an iterator to the element if found, else returns an iterator pointing to the end of unordered_set.

Below programs illustrate the unordered_set::find() function:

Program 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

// C++ program to illustrate the
// unordered_set::find() function
  
#include <iostream>
#include <string>
#include <unordered_set>
  
using namespace std;
  
int main()
{
  
    unordered_set<string> sampleSet = { "geeks1", "for", "geeks2" };
  
    // use of find() function
    if (sampleSet.find("geeks1") != sampleSet.end()) {
        cout << "element found." << endl;
    }
    else {
        cout << "element not found" << endl;
    }
  
    return 0;
}

chevron_right






                        filter_none









Output:


element found.





Program 2:











                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















// CPP program to illustrate the 


// unordered_set::find() function 


  


#include <iostream> 


#include <string> 


#include <unordered_set> 


  


using namespace std; 


  


int main() 


{ 


  


    unordered_set<string> sampleSet = { "geeks1", "for", "geeks2" }; 


  


    // use of find() function 


    if (sampleSet.find("geeksforgeeks") != sampleSet.end()) { 


        cout << "found" << endl; 


    } 


    else { 


        cout << "Not found" << endl; 


    } 


  


    return 0; 


} 



















                        chevron_right







                        filter_none









Output:


Not found






          
          
          
          

            

    

        My Personal Notes
        arrow_drop_up
    

    

        
        

            
            
        

    


Recommended Posts:
barykrg
Check out this Author's contributed articles.
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on  the "Improve Article" button below.