Question

Write a code fragment to insert and delete Hash Table entries. You are required to define the structure
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Answer #1
class Hash
{
    int numBuckets;
    list<int> *hashTable;
public:
    Hash(int V);
    void insertItem(int x);
    void deleteItem(int key);
    int hashFunction(int x) {
        return (x % numBuckets);
    }
};

Hash::Hash(int b)
{
    this->numBuckets = b;
    hashTable = new list<int>[numBuckets];
}

void Hash::insertItem(int key)
{
    int index = hashFunction(key);
    hashTable[index].push_back(key);
}

void Hash::deleteItem(int key)
{
    int index = hashFunction(key);

    list <int> :: iterator i;
    for (i = hashTable[index].begin();
         i != hashTable[index].end(); i++) {
        if (*i == key)
            break;
    }

    if (i != hashTable[index].end())
        hashTable[index].erase(i);
}
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