C Program To Implement Dictionary Using - Hashing Algorithms

case 6: printf("Exiting...\n"); break;

Delete a key-value pair

// If key doesn't exist, insert at the head of the list newItem->next = ht->table[index]; ht->table[index] = newItem; printf("Key %d inserted (Collision handled).\n", key);

The following example uses a simple hash function and separate chaining to handle collisions. c program to implement dictionary using hashing algorithms

curr = curr->next;

Hashing transforms a variable-length key into a fixed-size integer index. This index determines where the corresponding value is stored in an array. Hash Functions

char* dict_get(Dictionary *dict, const char *key) unsigned int index = hash(key, dict->size); Entry *curr = dict->buckets[index]; while (curr) if (strcmp(curr->key, key) == 0) return curr->value; curr = curr->next; case 6: printf("Exiting

Memory allocation requires strict handling in C to prevent leaks and segmentation faults.

We define two structures:

-------------------------------------------------------------*/ void dict_insert(Dict *d, const char *key, int value) unsigned int idx = hash(key, d->size); Node *curr = d->table[idx]; Resizing involves creating a new, larger bucket array

The basic implementation above can be extended in several ways:

Save the full code in a file hash_dict.c . Compile with GCC:

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

dict_delete() :

To mitigate worst‑case behaviour, we can periodically the table (rehashing) when the load factor exceeds a threshold (e.g., 0.75). Resizing involves creating a new, larger bucket array and re‑inserting all entries.