C SHARP - HASH TABLE CODE

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Example :

using System.Collections;

public class HashTableApplication {

    public static void Main(string[] args) {

        Hashtable hashtable = new Hashtable();

        hashtable.Add("ABA", 13);
        hashtable.Add("CAB", 12);
        hashtable.Add("BAC", 15);

        int i = (int)hashtable["ABA"];

        System.Console.WriteLine( "ABAs age is "+i);

        int j = (int)hashtable["BAC"];

        System.Console.WriteLine( "BACs age is "+j);
    }
}

Output :

ABAs age is 13
BACs age is 15

Code explanation for Hash Table

Luckily, C# already provides Hashtable defined in System.Collections.

All we have done is imported it and used it.

using System.Collections;

As we know we have stored the names ABA, CAB and BAC and their corresponding ages 13, 12 and 15 in the Hashtable.

hashtable.Add("ABA", 13);
hashtable.Add("CAB", 12);
hashtable.Add("BAC", 15);

But how they are stored in the HashTable will be decided by C#. As we are using the Hashtable provided by C#.

So, for ABA, a Hash Code is calculated by C# and the age of ABA is stored in some location decided by C#.

Similarly, the age of CAB and BAC is stored in the Hashtable after C# calculates the Hash Code, and decides where they will be stored.

Then we try to retrieve the age of ABA.

int i = (int)hashtable["ABA"];

So, we pass the name of ABA and internally C# calculates the Hash Code for ABA and gives us the age of ABA from the Hashtable.

And we print the age of ABA on the screen.

System.Console.WriteLine( "ABAs age is "+i);

Similarly we retrieve the age of BAC and print it on the screen.

int j = (int)hashtable.get("BAC");

System.Console.WriteLine( "BACs age is "+j);

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