C Program To Implement Dictionary Using Hashing Algorithms Link
free(old_buckets); To make the dictionary work with any data type, replace int value with void *value and store the size or use a union. 6.3 Thread Safety For multithreaded programs, add mutex locks per bucket (fine-grained locking) or a single global lock (coarse-grained but simpler):
// Re-insert all old entries for (int i = 0; i < old_size; i++) KeyValuePair *current = old_buckets[i]; while (current) insert(table, current->key, current->value); KeyValuePair *temp = current; current = current->next; free(temp->key); free(temp); c program to implement dictionary using hashing algorithms
While C lacks built-in dictionaries, mastering this implementation gives you complete control over performance and memory—something higher-level languages abstract away. Whether you're building a compiler symbol table, a database index, or a caching system, this hash table dictionary will serve you well. free(old_buckets); To make the dictionary work with any
We'll also implement the hash as an alternative for comparison. We'll also implement the hash as an alternative
KeyValuePair *current = table->buckets[index]; while (current) if (strcmp(current->key, key) == 0) if (found) *found = 1; return current->value; current = current->next;
// Insert or update a key-value pair void insert(HashTable *table, const char *key, int value) if (!table // Search: returns the value if key exists, or -1 if not found // (In production, use a status flag or pointer to indicate failure) int search(HashTable *table, const char *key, int *found) !key) if (found) *found = 0; return -1; unsigned long hash = hash_djb2(key); int index = hash % table->size;
return 0; // Key not found // Display all key-value pairs (for debugging) void display(HashTable *table) if (!table) return; printf("\n=== Dictionary Contents (Total: %d entries) ===\n", table->count); for (int i = 0; i < table->size; i++) if (table->buckets[i]) printf("Bucket[%d]: ", i); KeyValuePair *current = table->buckets[i]; while (current) printf("(%s -> %d) ", current->key, current->value); current = current->next; printf("\n");