Working with 'map'

[eranga262154]

It's me again,

Last night I start to learn about map. Feel it is so useful when I want to work with data basket without using a database. Because no need to worried about data set, data connections and stuff.

Anyway, I got the knowledge about map in useful level. But I have a point that mess on it. I'll explain it in this way.

First I've define the data map and insert some value as follows.

map<string, int> data_map; // map definitions

// Inserting values
	data_map["One"] = 1;
	data_map["Two"] = 2;
	data_map["Three"] = 3;

Now I want to allow user to check there is available his/her entry. I've done it as follows.

string map_entry;
cout << "Enter a word:\t";
getline(cin, map_entry);
	if(data_map.find(map_entry) != data_map.end())
	{	
		
		cout << "Your entry have the value of " << data_map[map_entry] << endl;		
	}
	else
	{
		cout << "Your entry is not in the data_map" << endl;
	}

It's ok to me. Then I've try to work it out with iterator, as follows.

map<string, int>::iterator data_map_iterator;// data_map iterator
	if((data_map_iterator = data_map.find(map_entry)) != data_map.end())
	{	
		cout << "Your entry is " << data_map_iterator->first << " and the entry value is " << data_map_iterator->second << endl;
	}
	else
	{
		cout << "Your entry is not in the data_map" << endl;
	}

In simply what is the real use of iterator and what is the effect of it my two code segments.