C++ Map

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A map is an associate container for storing unique key-value pairs.

 

key: The key data type to be stored in the map.

 

type: The data type of value to be stored in the map.

 

compare: A comparison class that takes two arguments of the same type bool and returns a value.

Syntax:

template < class Key, class T, class Compare = less<Key>, 
class Alloc = allocator<pair <const Key,T> > > class map;

Example:

#include <string.h>  
#include <iostream>  
#include <map>  
#include <utility> 

using namespace std;  
int main()  
{  
    map<int, string> Student;   
    Student[01] = "Manivannan";  
    Student[02] = "Arunkumar";  
    Student[03] = "Deepalakshmi";  
    Student[04] = "Ramesh Gandhi";  
    Student[05] = "Backiyalakshmi";
    Student[06] = "Sundar Rajan";   
    cout << "Map size: " << Student.size() << endl;  
    cout << "List of Student Name:" << endl; 
    map<int,string>::iterator it=Student.begin();
    while(it!=Student.end())
    {
        cout << (*it).first << ": " << (*it).second << endl;
        ++it;
    }
    return 0;
}
Run ›
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