In this tutorial, we will see a C++ multimap example to find a value in a map with duplicate key values.
C++ Header Files for multimap Program
#include <iostream> #include <map> #include <vector> #include <iterator> #include <algorithm>
multimap Initialization in C++
multimap< string, long > contacts = {
{ "V.Jegan", 2232342323 },
{ "R.Meena", 3243435323 },
{ "V.Nitesh",6234324323 },
{ "S.Sriram",8932443221 },
{ "V.Nitesh",5534327326 }
};Finding a Key in multimap
auto pos = contacts.find ( "V.Nitesh" );
Iterating in multimap
while ( pos != contacts.end() ) {
cout << "\nMobile number of " << pos->first << " is " << pos->second << endl;
++pos;
}Complete C++ multimap Example
In the following example, it will find the key V.Nitesh and will print the contact number if found.
#include <iostream>
#include <map>
#include <vector>
#include <iterator>
#include <algorithm>
using namespace std;
int main( ) {
multimap< string, long > contacts = {
{ "V.Jegan", 2232342323 },
{ "R.Meena", 3243435323 },
{ "V.Nitesh",6234324323 },
{ "S.Sriram",8932443221 },
{ "V.Nitesh",5534327326 }
};
auto pos = contacts.find ( "V.Nitesh" );
int count = contacts.count( "V.Nitesh" );
int index = 0;
while ( pos != contacts.end() ) {
cout << "\nMobile number of " << pos->first << " is " << pos->second << endl;
++index;
if ( index == count )
break;
}
cout << "--------------------------------------------------------------" << endl;
pos = contacts.begin();
while ( pos != contacts.end() ) {
cout << "\nMobile number of " << pos->first << " is " << pos->second << endl;
++pos;
}
return 0;
}
Output
Mobile number of V.Nitesh is 6234324323 Mobile number of V.Nitesh is 6234324323 -------------------------------------------------------------- Mobile number of R.Meena is 3243435323 Mobile number of S.Sriram is 8932443221 Mobile number of V.Jegan is 2232342323 Mobile number of V.Nitesh is 6234324323 Mobile number of V.Nitesh is 5534327326
- Ref: C++ multimap
