: Hash the key and traverse the linked list at that index using strcmp to find the exact match.
// Update existing key put(dict, "apple", 99); c program to implement dictionary using hashing algorithms
// Rehash all entries for (unsigned long i = 0; i < old_size; i++) Entry *curr = old_buckets[i]; while (curr) Entry *next = curr->next; unsigned long new_index = dict->hash_func(curr->key) % dict->size; curr->next = dict->buckets[new_index]; dict->buckets[new_index] = curr; dict->count++; curr = next; : Hash the key and traverse the linked
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. While languages like Python, Java, and C++ have
return 0; // key not found
void insert(const char *key, const char *value) unsigned int index = hash(key); Entry *new_entry = dictionary[index]; // Check if key already exists to update it while (new_entry != NULL) if (strcmp(new_entry->key, key) == 0) free(new_entry->value); new_entry->value = strdup(value); return; new_entry = new_entry->next; // Create a new entry if not found new_entry = malloc(sizeof(Entry)); new_entry->key = strdup(key); new_entry->value = strdup(value); new_entry->next = dictionary[index]; // Insert at the head of the list dictionary[index] = new_entry; Use code with caution. Copied to clipboard
