C Program To Implement Dictionary Using Hashing Algorithms [exclusive] Access

Building a High-Performance Dictionary in C: A Complete Guide to Hashing Algorithms

Introduction

In the realm of computer science, a dictionary (also known as a map, symbol table, or associative array) is one of the most fundamental and versatile data structures. It allows you to store key-value pairs and retrieve values in near-constant time, regardless of the size of the data. While languages like Python, Java, and C++ have built-in dictionary implementations (e.g., dict, HashMap, std::unordered_map), the C programming language does not provide a standard one. This forces C developers to implement their own dictionary from scratch.

4.4 Delete a Key-Value Pair

// Delete a key from the dictionary
int delete_key(HashTable *table, const char *key) 
    if (!table

// Update insert(myDict, "apple", 15); // Update apple's value

Requires extra memory for pointers.
Cache performance suffers due to linked list traversal.

KeyValue *current = dict->table[index]; // Case A: Key exists? Update the value. while (current != NULL) if (strcmp(current->key, key) == 0) current->value = value; return;

3.5 Resizing the Dictionary

Resizing involves creating a new larger bucket array, rehashing all entries, and freeing the old structure. c program to implement dictionary using hashing algorithms

The Complete Implementation

Below is a complete, compilable C program. It implements a Dictionary with String keys and Integer values. Building a High-Performance Dictionary in C: A Complete

Calculates the index using the hash function.
If the bucket is empty, it places the new item there.
Collision Handling: If the bucket is not empty, it iterates through the linked list. If the key already exists, it updates the value. If not, it adds the new node to the beginning of the list.

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