C++ Program to Implement Hash Tables

```
#include<iostream>
```
```
#include<cstdlib>
```
```
#include<string>
```
```
#include<cstdio>
```
```
using namespace std;
```
```
const int TABLE_SIZE = 128;
```
```
 
```
```
/*
```
```
 * HashEntry Class Declaration
```
```
 */
```
```
class HashEntry
```
```
{
```
```
    public:
```
```
        int key;
```
```
        int value;
```
```
        HashEntry(int key, int value)
```
```
        {
```
```
            this->key = key;
```
```
            this->value = value;
```
```
        }
```
```
};
```
```
 
```
```
/*
```
```
 * HashMap Class Declaration
```
```
 */
```
```
class HashMap
```
```
{
```
```
    private:
```
```
        HashEntry **table;
```
```
    public:   
```
```
        HashMap()
```
```
 {
```

            table = new HashEntry * [TABLE_SIZE];

            for (int i = 0; i< TABLE_SIZE; i++)

```
            {
```
```
                table[i] = NULL;
```
```
            }
```
```
        }
```
```
        /*
```
```
         * Hash Function
```
```
         */
```
```
        int HashFunc(int key)
```
```
        {
```
```
            return key % TABLE_SIZE;
```
```
        }
```
```
        /*
```
```
         * Insert Element at a key
```
```
         */
```
```
 void Insert(int key, int value)
```
```
 {
```
```
            int hash = HashFunc(key);
```

            while (table[hash] != NULL && table[hash]->key != key)

```
            {
```

                hash = HashFunc(hash + 1);

```
            }
```
```
            if (table[hash] != NULL)
```
```
                delete table[hash];
```

            table[hash] = new HashEntry(key, value);

```
 }
```
```
        /*
```
```
         * Search Element at a key
```
```
         */
```
```
        int Search(int key)
```
```
 {
```
```
     int  hash = HashFunc(key);
```

     while (table[hash] != NULL && table[hash]->key != key)

```
     {
```
```
         hash = HashFunc(hash + 1);
```
```
     }
```
```
     if (table[hash] == NULL)
```
```
         return -1;
```
```
     else
```
```
         return table[hash]->value;
```
```
        }
```
```
 
```
```
        /*
```
```
         * Remove Element at a key
```
```
         */
```
```
        void Remove(int key)
```
```
 {
```
```
     int hash = HashFunc(key);
```
```
     while (table[hash] != NULL)
```
```
     {
```
```
         if (table[hash]->key == key)
```
```
             break;
```
```
         hash = HashFunc(hash + 1);
```
```
     }
```
```
            if (table[hash] == NULL)
```
```
     {
```

                cout<<"No Element found at key "<<key<<endl;

```
                return;
```
```
            }
```
```
            else
```
```
            {
```
```
                delete table[hash];
```
```
            }
```

            cout<<"Element Deleted"<<endl;

```
        }
```
```
        ~HashMap()
```
```
 {
```

            for (int i = 0; i < TABLE_SIZE; i++)

```
            {
```
```
                if (table[i] != NULL)
```
```
                    delete table[i];
```
```
                delete[] table;
```
```
            }
```
```
        }
```
```
};
```
```
/*
```
```
 * Main Contains Menu
```
```
 */
```
```
int main()
```
```
{
```
```
    HashMap hash;
```
```
    int key, value;
```
```
    int choice;
```
```
    while (1)
```
```
    {
```

        cout<<"\n----------------------"<<endl;

        cout<<"Operations on Hash Table"<<endl;

        cout<<"\n----------------------"<<endl;

        cout<<"1.Insert element into the table"<<endl;

        cout<<"2.Search element from the key"<<endl;

        cout<<"3.Delete element at a key"<<endl;

```
        cout<<"4.Exit"<<endl;
```
```
        cout<<"Enter your choice: ";
```
```
        cin>>choice;
```
```
        switch(choice)
```
```
        {
```
```
        case 1:
```

            cout<<"Enter element to be inserted: ";

```
            cin>>value;
```

            cout<<"Enter key at which element to be inserted: ";

```
            cin>>key;
```
```
            hash.Insert(key, value);
```
```
            break;
```
```
        case 2:
```

            cout<<"Enter key of the element to be searched: ";

```
            cin>>key;
```
```
            if (hash.Search(key) == -1)
```
```
            {
```

         cout<<"No element found at key "<<key<<endl;

```
         continue;
```
```
     }
```
```
     else
```
```
     {
```

         cout<<"Element at key "<<key<<" : ";

```
         cout<<hash.Search(key)<<endl;
```
```
     }
```
```
            break;
```
```
        case 3:
```

            cout<<"Enter key of the element to be deleted: ";

```
            cin>>key;
```
```
            hash.Remove(key);
```
```
            break;
```
```
        case 4:
```
```
            exit(1);
```
```
        default:
```

           cout<<"\nEnter correct option\n";

```
       }
```
```
    }
```
```
    return 0;
```
```
}
```

OUTPUT

Operations on Hash Table

----------------------
1.Insert element into the table
2.Search element from the key
3.Delete element at a key
4.Exit
Enter your choice: 1
Enter element to be inserted: 12
Enter key at which element to be inserted: 1

----------------------
Operations on Hash Table

----------------------
1.Insert element into the table
2.Search element from the key
3.Delete element at a key
4.Exit
Enter your choice: 1
Enter element to be inserted: 24
Enter key at which element to be inserted: 2

----------------------
Operations on Hash Table

----------------------
1.Insert element into the table
2.Search element from the key
3.Delete element at a key
4.Exit
Enter your choice: 1
Enter element to be inserted: 36
Enter key at which element to be inserted: 3

----------------------
Operations on Hash Table

----------------------
1.Insert element into the table
2.Search element from the key
3.Delete element at a key
4.Exit
Enter your choice: 1
Enter element to be inserted: 48
Enter key at which element to be inserted: 4

----------------------
Operations on Hash Table

----------------------
1.Insert element into the table
2.Search element from the key
3.Delete element at a key
4.Exit
Enter your choice: 1
Enter element to be inserted: 60
Enter key at which element to be inserted: 5

----------------------
Operations on Hash Table

----------------------
1.Insert element into the table
2.Search element from the key
3.Delete element at a key
4.Exit
Enter your choice: 2
Enter key of the element to be searched: 3
Element at key 3 : 36

----------------------
Operations on Hash Table

----------------------
1.Insert element into the table
2.Search element from the key
3.Delete element at a key
4.Exit
Enter your choice: 2
Enter key of the element to be searched: 5
Element at key 5 : 60

----------------------
Operations on Hash Table

----------------------
1.Insert element into the table
2.Search element from the key
3.Delete element at a key
4.Exit
Enter your choice: 3
Enter key of the element to be deleted: 4
Element Deleted

----------------------
Operations on Hash Table

----------------------
1.Insert element into the table
2.Search element from the key
3.Delete element at a key
4.Exit
Enter your choice: 2
Enter key of the element to be searched: 4
No element found at key 4

----------------------
Operations on Hash Table

----------------------
1.Insert element into the table
2.Search element from the key
3.Delete element at a key
4.Exit
Enter your choice: 2
Enter key of the element to be searched: 2
Element at key 2 : 24

----------------------
Operations on Hash Table

----------------------
1.Insert element into the table
2.Search element from the key
3.Delete element at a key
4.Exit
Enter your choice: 4

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C++ Program to Implement Hash Tables

OUTPUT

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