C Program To Implement Dictionary Using Hashing Algorithms Today

To achieve near-instantaneous lookups, we use . This article will guide you through the logic, the algorithms, and a complete C implementation of a dictionary using a Hash Table. How Hashing Works

-------------------------------------------------------------*/ void dict_display(const Dict *d) if (d->count == 0) printf("Dictionary is empty.\n"); return;

The complete code above offers a solid foundation that can be extended with generics (using void* ), custom hash functions for different key types, or thread-safety mechanisms for concurrent access.

-------------------------------------------------------------*/ void dict_insert(Dict *d, const char *key, int value) unsigned int idx = hash(key, d->size); Node *curr = d->table[idx]; c program to implement dictionary using hashing algorithms

Add mutex locks for concurrent access in multithreaded programs.

Create a new dictionary with given table size

if (!dict->buckets) free(dict); return NULL; To achieve near-instantaneous lookups, we use

void resize(HashTable **dict, int new_size) HashTable *old_dict = *dict; HashTable *new_dict = create_dict(new_size); // Rehash all entries for (int i = 0; i < old_dict->size; i++) Entry *curr = old_dict->buckets[i]; while (curr) put(new_dict, curr->key, curr->value); curr = curr->next;

// Display all entries printf("\nDictionary contents:\n"); for (int i = 0; i < dict->size; i++) Entry *curr = dict->buckets[i]; if (curr) printf("Bucket %d: ", i); while (curr) printf("(%s:%d) ", curr->key, curr->value); curr = curr->next;

If you found this article helpful, share it with fellow C programmers. For questions or improvements, leave a comment below. In computer science, a (also known as a

In computer science, a (also known as a symbol table, associative array, or map) is an abstract data type that stores key‑value pairs. It provides efficient insertion, deletion, and lookup operations based on the key. Dictionaries are ubiquitous in software development – from compilers storing variable names and their attributes, to databases indexing records, to caching systems.

// Create a new hash table with given number of buckets HashTable* create_table(int size) HashTable table = malloc(sizeof(HashTable)); if (!table) return NULL; table->size = size; table->buckets = calloc(size, sizeof(Entry )); if (!table->buckets) free(table); return NULL;