# Hash Table C Program

By | August 31, 2016

## C Program To Create Hash Table using Linear Probing

Learn How To Create Hash Table in C Programming Language. This Program For Hashing in C Language uses Linear Probing Algorithm in Data Structures. Hash Tables are also commonly known as Hash Maps. The functions such as Insertion, Deletion and Searching Records in the Hash Tables are included in the following Hash Table Program.

There are different Searching Algorithms such as Linear Search and Binary Search in which the search time is dependent on the Number of Elements.  In Hash Tables, less key comparisons are made which thereby helps to perform search operation in a Constant Time. Therefore, the Search Time is not dependent on the Number of Elements.

#### Hash Table Concept

The process of converting a key to an Address (Index Position of an Array) is called Hashing or Key To Address transformation done through Hash Functions.

We require a method through which we can convert the key into an integer within a range, and this converted value can be used as index of the array. Instead of taking the key equal to the array index, we can compute the array index from the key.

A Hash Function is used to generate an address from a key or we can say that each key is mapped on a particular index through the hash function. This Hash Function takes key as an Input and returns the Hash value of that key which is used as the address for storing the key in the array. This implementation of Hash Table using Linear Probing method uses Open Addressing method.

#### Output

In case you get any Compilation Errors in this Hash Tables C Program using Array and Structures or if you have any doubts about it, let us know about it in the Comment Section below.

## 14 thoughts on “Hash Table C Program”

1. Rajesh Mehta

This is such a simple program for Hashing Implementation. Thanks.

2. Pankaj Dhende

Which other Algorithms are used for Hashing Implementation, especially in C Programming?

1. Tushar Soni Post author

1. Division Remainder Method
2. Folding Method
4. Digit Re- arrangement Method

3. Tushar Soni Post author

You’rr welcome Rajesh.

4. Pankaj Sawant

Are these Algorithms used in real-world?

1. Tushar Soni Post author

I am not sure whether these algorithms are used in realtime! But, there are many advanced algorithms such as these:
1. MD2 (Message Digest Algorithm 2)
2. MD4 (Message Digest Algorithm 4)
3. MD5 (Message Digest Algorithm 5)
4. Secure Hash Algorithm (SHA)

5. Vir Das

Instead of implementing hash tables using structures, can we implement hash table using Arrays?

6. Vipul Kedia

I think separate chaining is better than linear probing method for hash table in C programming.

7. Ashutosh Das

Does linear probing use Open Addressing for Hash Table implementation?

8. Tejas Kulkarni

Can we implement hash table using linked list in c programming?

9. Darshan Choudhary

It is one of the simplest hash table implementation in c i have seen. Hash tables using structures are less efficient than the hash tables that use linked lists.

10. Darshana Yadav

What is the difference between Hash Table using Linear Probing and Separate Chaining methods?

11. John Abraham

The searching technique that takes O(1) time complexity to find a data or element in an array or a list is Hashing. Therefore, it is really fast.

12. Sathish Arumugam

A hash table in which the hash function is the last few bits of the key and the table refers to buckets is called as Extendible hashing.