C Program To Implement Dictionary Using Hashing Algorithms |top| Direct

// 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;

#include <stdio.h> #include <stdlib.h> #include <string.h>

// Check if key already exists KeyValuePair *current = table->buckets[index]; while (current) if (strcmp(current->key, key) == 0) // Key exists: update value current->value = value; return;

typedef struct Node char *key; char *value; struct Node *next; Node; Use code with caution. 2. The Hash Table The table itself is an array of pointers to these nodes.

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#include #include #include #define TABLE_SIZE 10007 // A prime number minimizes clustering // Define the structure for a dictionary node typedef struct DictNode char *key; int value; struct DictNode *next; DictNode; // Define the Hash Table structure typedef struct DictNode *buckets[TABLE_SIZE]; Dictionary; // DJB2 Hashing Algorithm unsigned int hash_function(const char *key) unsigned long hash = 5381; int c; while ((c = *key++)) hash = ((hash << 5) + hash) + c; // hash * 33 + c return hash % TABLE_SIZE; // Initialize the dictionary Dictionary* create_dictionary() Dictionary *dict = (Dictionary*)malloc(sizeof(Dictionary)); if (!dict) perror("Failed to allocate memory for dictionary"); exit(EXIT_FAILURE); for (int i = 0; i < TABLE_SIZE; i++) dict->buckets[i] = NULL; return dict; // Insert or update a key-value pair void dict_insert(Dictionary *dict, const char *key, int value) unsigned int index = hash_function(key); DictNode *current = dict->buckets[index]; // Check if the key already exists to update its value while (current != NULL) if (strcmp(current->key, key) == 0) current->value = value; return; current = current->next; // Key does not exist, create a new node DictNode *new_node = (DictNode*)malloc(sizeof(DictNode)); if (!new_node) perror("Failed to allocate memory for node"); exit(EXIT_FAILURE); new_node->key = strdup(key); // Duplicate string to ensure ownership new_node->value = value; // Insert at the beginning of the chain (O(1) insertion) new_node->next = dict->buckets[index]; dict->buckets[index] = new_node; // Search for a value by key // Returns 1 if found and updates the value pointer, 0 otherwise int dict_search(Dictionary *dict, const char *key, int *found_value) unsigned int index = hash_function(key); DictNode *current = dict->buckets[index]; while (current != NULL) if (strcmp(current->key, key) == 0) *found_value = current->value; return 1; // Success current = current->next; return 0; // Not found // Delete a key-value pair from the dictionary int dict_delete(Dictionary *dict, const char *key) unsigned int index = hash_function(key); DictNode *current = dict->buckets[index]; DictNode *prev = NULL; while (current != NULL) if (strcmp(current->key, key) == 0) if (prev == NULL) // Node to delete is the head of the chain dict->buckets[index] = current->next; else // Node to delete is in the middle or end prev->next = current->next; free(current->key); free(current); return 1; // Deleted successfully prev = current; current = current->next; return 0; // Key not found // Free all memory allocated for the dictionary void free_dictionary(Dictionary *dict) for (int i = 0; i < TABLE_SIZE; i++) DictNode *current = dict->buckets[i]; while (current != NULL) DictNode *temp = current; current = current->next; free(temp->key); free(temp); free(dict); // Driver program to demonstrate functionality int main() Dictionary *my_dict = create_dictionary(); // Inserting pairs dict_insert(my_dict, "alice", 25); dict_insert(my_dict, "bob", 30); dict_insert(my_dict, "charlie", 35); // Updating an existing key dict_insert(my_dict, "alice", 26); // Searching items int value; if (dict_search(my_dict, "alice", &value)) printf("Found 'alice' with value: %d\n", value); else printf("'alice' not found.\n"); if (dict_search(my_dict, "unknown", &value)) printf("Found 'unknown' with value: %d\n", value); else printf("'unknown' not found.\n"); // Deleting an item if (dict_delete(my_dict, "bob")) printf("Deleted 'bob' successfully.\n"); // Confirming deletion if (!dict_search(my_dict, "bob", &value)) printf("'bob' is no longer in the dictionary.\n"); // Clean up memory free_dictionary(my_dict); return 0; Use code with caution. Technical Breakdown of Operations 1. Collision Handling Strategy

printf("=== Dictionary Implementation using Hashing in C ===\n\n");

: The removal process traces nodes with a lagging pointer ( prev ). This connects the preceding chain element directly to the subsequent element, ensuring the linked list remains unbroken when an intermediate item is dropped. Performance Analysis Average Case Complexity Worst Case Complexity Description Insertion

new_pair->next = table->buckets[index]; table->buckets[index] = new_pair; table->count++; This public link is valid for 7 days

temp = temp->next; // Key not found, create new entry Entry *new_entry = malloc(

In this paper, we implemented a dictionary using hashing algorithms in C programming language. We discussed the design and implementation of the dictionary, including the hash function, insertion, search, and deletion operations. The C code provided demonstrates the implementation of the dictionary using hashing algorithms. This implementation provides efficient insertion, search, and deletion operations, making it suitable for a wide range of applications.

💡 : Faster than Binary Search Trees for lookups.💡 Memory : More efficient than huge arrays when keys are non-integer strings.💡 Flexibility : Can be easily adapted to store any data type (integers, floats, or custom objects). If you'd like to refine this, A more advanced hash function like DJB2. Code to delete items from the dictionary. Share public link

Hashing is a technique used to map a large input (such as a string or an integer) to a fixed-size output, known as a hash value or digest. This hash value is used to identify the location of the data in a data structure, making it possible to retrieve the data efficiently. Can’t copy the link right now

need to write a long article about implementing a dictionary in C using hashing algorithms. The keyword is "c program to implement dictionary using hashing algorithms". The article should be comprehensive, educational, likely covering concepts of dictionary (key-value store), hash tables, hash functions, collision resolution (chaining or open addressing), and a full C implementation. Provide code examples, explanations, complexity analysis, and possibly testing. The article should be long, detailed, suitable for a programming tutorial.

// Destroy the entire hash table void destroy_table(HashTable *table) if (!table) return; for (int i = 0; i < table->size; i++) Entry *current = table->buckets[i]; while (current) Entry *temp = current; current = current->next; free_entry(temp);

This guide will walk you through building a robust dictionary using a hash table with collision handling. Understanding the Core Logic A hash-based dictionary relies on three main components: : A key-value pair container.