STL container classes: An object which holds a collection of values or other objects is termed as container. There are two types of container class: sequence associative Associative container: Associative container is the process of storing the data in a non-sequential order in memory. Example of associative container: set map multiset multimap unordered_map Set: A “set” belongs to an associative container which holds a group of unique values. STL class template can be used to implement a “set” container. Only unique elements should be stored in the set. It should not have the same value for two elements. The elements contains in the set are automatically sorted in ascending order. In order to use “set” class, the header file “#include<set>” should be included in the program. Multiset: A “multiset” is an associative container which holds the duplicate elements. STL class template can be used to implement a “multiset” container. The multiset can store duplicate elements. The two elements can have same values. The element present in a multiset cannot be modified in the container but can be inserted or deleted. In order to use multiset class “# include” the “<set>” header file in the program. “count()” member function: The “count()” member function searches the element which matches the specified element in the container and returns the number of matches.

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Chapter 17, Problem 10RQE

Program Plan Intro

STL container classes:

An object which holds a collection of values or other objects is termed as container.

There are two types of container class:

sequence

associative

Associative container:

Associative container is the process of storing the data in a non-sequential order in memory.

Example of associative container:

set

map

multiset

multimap

unordered_map

Set:

A “set” belongs to an associative container which holds a group of unique values. STL class template can be used to implement a “set” container.

Only unique elements should be stored in the set. It should not have the same value for two elements.

The elements contains in the set are automatically sorted in ascending order.

In order to use “set” class, the header file “#include<set>” should be included in the program.

Multiset:

A “multiset” is an associative container which holds the duplicate elements. STL class template can be used to implement a “multiset” container.

The multiset can store duplicate elements. The two elements can have same values.

The element present in a multiset cannot be modified in the container but can be inserted or deleted.

In order to use multiset class “# include” the “<set>” header file in the program.

“count()” member function:

The “count()” member function searches the element which matches the specified element in the container and returns the number of matches.

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