Mastering C++ Programming

Code walkthrough

The following line declares a map with a string name as the key and a long mobile number as the value stored in the map:

map< string, long > contacts;

The following code snippet adds four contacts organized by name as the key:

 contacts[ "Jegan" ] = 1234567890; contacts[ "Meena" ] = 5784433221; contacts[ "Nitesh" ] = 4567891234; contacts[ "Sriram" ] = 8901122334;

The following line will try to locate the contact with the name, Sriram, in the contacts map; if Sriram is found, then the find() function will return the iterator pointing to the location of the key-value pair; otherwise it returns the contacts.end() position:

 auto pos = contacts.find( "Sriram" );

The following code verifies whether the iterator, pos, has reached ...