C Program To Implement Dictionary Using Hashing Algorithms 99%

No hashing algorithm is completely immune to collisions (when two unique strings generate the identical hash index). This implementation uses . When a collision occurs, the items are stored sequentially in a singly linked list at that specific array bucket. 2. Optimization with Prime Array Sizes

void insert(Dictionary *dict, const char *key, const char *value) unsigned long hash = dict->hash_func(key); unsigned long index = hash % dict->size; // Check if key already exists Entry *curr = dict->buckets[index]; while (curr) if (strcmp(curr->key, key) == 0) // Update existing value free(curr->value); curr->value = strdup(value); return;

[Hash Table] Index 0 -> [Node: "apple" -> 5] -> [Node: "banana" -> 12] -> NULL Index 1 -> NULL Index 2 -> [Node: "cherry" -> 7] -> NULL Choosing a Hashing Algorithm c program to implement dictionary using hashing algorithms

Returns 1 if found (value stored in *val), 0 otherwise

A unique identifier used to locate the value (e.g., a "word" or an "ID"). No hashing algorithm is completely immune to collisions

Ideally, two different keys would never map to the same index. In reality, because the set of possible keys is usually larger than the size of the array, collisions are inevitable.

Inserts at the head of the chain. Cost comes from collision checking. In reality, because the set of possible keys

Returns 1 if key was found and deleted, 0 otherwise