C Program To Implement Dictionary Using | Hashing Algorithms

Implementing a Dictionary in C Using Hashing Algorithms A dictionary is an abstract data type that stores data as key-value pairs. It allows you to look up, insert, and delete elements efficiently using a unique key. While high-level languages like Python and Java provide built-in dictionaries or maps, C requires you to build this structure from scratch.

(with a good hash function and uniform distribution): Insert, search, delete – O(1 + α) , where α = n / table_size is the load factor. Since we keep the table size roughly proportional to the number of entries, α is constant.

printf("\n");

int main() // Create a dictionary with 10 buckets HashTable *dict = create_table(10); if (!dict) fprintf(stderr, "Failed to create dictionary.\n"); return 1; c program to implement dictionary using hashing algorithms

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// Delete if (dict_remove(dict, "date")) printf("date removed\n");

new_entry->next = dict->buckets[index]; dict->buckets[index] = new_entry; dict->count++; Implementing a Dictionary in C Using Hashing Algorithms

printf("\n");

// Update an entry dict_put(dict, "apple", "a crisp fruit that grows on trees");

#include <stdio.h> #include <stdlib.h> #include <string.h> (with a good hash function and uniform distribution):

With the addition of dynamic resizing and a generic interface, this dictionary can serve as the foundation for more complex applications, such as caches, symbol tables in compilers, or database indexing.

The search function hashes the key and traverses the specific bucket's linked list to find a match.

In computer science, a dictionary (also known as a map, associative array, or symbol table) is a data structure that stores key-value pairs. It provides efficient insertion, deletion, and lookup operations. When implementing a dictionary in C—a language without built-in associative arrays—hashing algorithms offer the most practical and performant solution.