Abstract Data Type – What You Need to Know About It?

Abstract Data Type

If you want to know about the abstract data type, then it is the type of objects which all are defined from the set of values and operations. You can see that the explanation given for Abstract Data Type does not show any of its applications.

When you take a look at ADT, it doesn’t state about the operations and how all the data can get arranged in its memory. Moreover, it, too, does not give any information about the algorithms and their implementations in the operations as well.

For all these things, you can call it as Abstract as it helps the user to get an independent view for the implementation. Abstraction is all about giving useful information and also hides the details about it.

Why don’t users know the implementation?

If you look at it, then you can know that the user who all goes for data types doesn’t have any idea about the data type that is going or got implemented. You can understand the same in a better way by taking this example.


As a user, you might need the primitive values, which include float, int and char data. All the users have the idea and know-how these data types can get operate and can be performed without any knowledge about the implementation.

For all that reason, it is always an important thing that a user must know about it. To understand how it is all implemented, you can get the information here. When it’s coming, it has got three types of ADTs.

Types of abstract data type

Here are the different types of ADT:

List of abstract data type

In these Lists for ADT, it comes with the following things inside it.

  • All the data here are stored in the key sequence and that too in the list. It has got a main structure in which you can find various things.
  • In the ADT head structure, you can find pointers, count, and function adresses which are used for comparison. All these things are used to make the comparison in your list.
  • While user search for data nodes then these nodes points to the structure. Along with it, it has got a pointer that is self-referential. The pointer always points to the node that is present next to it.
  • Apart from these, the List ADT too got many functions in them. These functions are all mentioned below.
  1. get
  2. insert
  3. remove
  4. removeAt
  5. size
  6. isEmpty
  7. replace
  8. isFull

Queue abstract data type

The next kind of ADT that you can come across is Queue ADT. In these ADT, you can face the following things in it.

  • In the “Queue data type”, a user can get good knowledge about the ADT design in the stack.
  • When you take a look at the node of it, then you can find the void pointer in it, which points to data. The link pointer indicates the next element that is present in the queue.
  • The main aim of the pointer is to allocate the memory where you can store the data.

Not only that, this Queue ADT has gone many elements that are of the same type, and all of it is present in sequential manner. All the operations in these ADT take place at both ends.   When you go for insertion then it  is done at the end and in same way deletion is done at the front or top.

The Queue ADT has got the following functions in it. They are here.

  • enqueue
  • dequeue
  • size
  • isEmpty
  • peek
  • isFull

Stack abstract data type

In the last abstract data type, you will come across the stack Abstract Types of Data. You can find the following as you read ahead:

  • In this stack ADT, you can see that all that data are stored in each node. You can find the pointer which points to data gets store in it.
  • All the programs here are there and help in allocating the memory for all kinds of data and addresses. After that, all the things are transfers to stack ADT.
  • Then you can find node head, as well as data nodes, state to be included in the it.
  • You can see that all the calling function present in there usually points to the stack.
  • You can see that head structure of the stack has got a pointer that points to the top  in the stack.

The stack has got some elements that are of the same type and is organized in sequential manner. The operations can take place in the single-end, and you can see that the top of stack end as well here with the following operations. These operations are done with the help of different functions. These functions are here.

  • push
  • pop
  • size
  • peek
  • isEmpty
  • isFull

So, with all these definitions, you can easily find that there is no specification about it all. For all these things, you can see that there are different ways by which they are implemented and ADT.

Implementation Of Abstract Type?

If you are interested in implementing the Abstract in your program, then you can go for providing the one function or procedure to all operation for abstract. When you take a look at it, then you can find that these ADT examples are there for the representation of the concrete the data structure and how they all are manipulated in the procedures.

As you are searching for ways to make it count in your program, you must know that there are various ways in it. These ways are used to apply the Abstract, and it depends on how you all implement the ADT in these packaged. The package states to act as the “Opaque Data form” in the modules.

Apart from these things, these modules to have got the best interface that have got a signature of all the operations. Not only that, but the module implementation is also stated of being the procedures bodies as well as concretes the data formation used in it. It acts as the hidden thing from the module clients.

When you go for the module implementation, then you can see all procedures and other concrete state of data types to be hidden in it. When you all consider these hidden things it shows no clients get affected. So, implementation is stated to be exposed, and it is used as the data type. So, when you all are implementing these things, you must keep in mind that its handle represents each of the instances.

What it looks like in Object-adjusted Languages

When you are going for the computer `languages like Java and C++ you can find many things here. You can find many forms of support for the ADT. In these classes, all these use as the type, and it is called as Abstract, which refers to all hidden representation.

If you take a look at this model, then you can go for the ADT and is implemented in the form of class. You can get the idea of going for all individual ADT instances, which is state to be the object for the class. In these all, the module interface states to help in declaring the constructors with the help of ordinary procedures.

Apart from all these things, you can see that most of ADT operations are considered as the methods for that class. But while going for it and taking an approach for it, then you can go for not so easy encapsulate multiple variants used for representational in ADT. Moreover, it too undermines all the extensions for OOPS. All these things are state of being behaviours and not representations.

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Types of implementation in the stack of abstract

To implement these things, there are two ways to it. You can get a whole idea by going through it here.

Imperative style interface

The interface that you all deal here can get implemented in different ways.

In the definition, you can find that it does not define any space that a stack uses and how much time did the operation take. But in reality, it must specify it and must be stay with proportional number among all items that are pushed, not popped as well. For all these things, it is good to know that you must finish it with a constant time, and that is independent of number as well. To get comply with all these; it is linked with an array or a list along with the integers.

Interface for Functional

In this type of interface, here, the implementation is functional style. It means that it is appropriate for you all to go for functional languages. Apart from these things, it, too, provides you with the functional interface to you all. All these are possible to you in the language, which includes the C.

Operations of the abstract data type

If you all are going for the Abstract Data Interface, then it comes in these. They all are mentioned below.

  • Compare- In these functions, it compares between two states and gives results.
  • Hash- In this function, it computes all standard function of hash from instance state.
  • Print- The main work of the function is to give the results or show the results.
  • Create- It is there and helps to give new instances of the ADT.
  • Copy- It copies one state to another state.
  • Initialize- The function helps you in creating the new instances for operations. While creating it, it takes them to the initial state.
  • Clone- It performs and clones the results or procedure that you want.
  • Free- It helps in clearing the memory and other resources in there.


If you are going for the Abstract Type, then you can find that various things are there. These things are mentioned below.

Localization of change

It is a kind of code that is used here in the ADT object. It to don’t need to get edited if it is going to get implemented if ADT is changed. As there is a change in the implementation, so it must comply with the interface, and code must be used as the ADT object. All these changes state to be the kind of implementation that remains without any changes in code, and that is the place where ADT is used as well.


In this case, it is seen that abstraction helps in providing the promise of these things in any way of implementation. All the implementation is done in the ADT, and it has got the best properties as well as abilities. You must know that all these things are state to be required to use it as the abstract data type. If a user doesn’t know about the implementation, then you all can use the same in the encapsulated manner without any problem. It is because the interface usually remains complex, and for it must be done simply and easily.


The last thing that you will get from the Abstract Data is its flexibility. It means that you all can have the same kind of properties as well as abilities. Not only that, they must be equivalent and can get used interchangeably in code. The code that here is mentioned states to get used in ADT. It, too, gives a great deal of flexibility when you, as a user, use the ADT objects in different situations. You can see that all these implementations can be efficient in different situations. So, for all these things, it is also possible that you take each of the situations and how they all are preferable over other stuff in here. The best part of it is they all help in increasing efficiency as well.

These are the top advantages that you all can get when you all are going for the Abstract Data Type. You can get a whole idea about ADT and its implementation in the above article. You will surely get a good idea about it from here.

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