WRITE A PROGRAM TO COUNT THE NUMBER OF DOUBLE LETTER SEQUENCE IN A STRING.

 THE FOLLOWING PROGRAM SEGMENT SHOWS HOW TO COUNT THE NO. OF DOUBLE LETTER SEQUENCES. 

import java.util.*;

class doubleSEQ

{

    public static void main (String args[])

    {

        Scanner ob = new Scanner (System.in);

        System.out.println("enter any string");

        String s = ob.nextLine();

        String s1 = s.toUpperCase();

        s1 = s1.trim();

        int c = 0, l;

        char ch1, ch2;

        l = s1.length();

        for(int i = 0; i<l-2; i++)

        {

            ch1 = s1.charAt(i);

            ch2 = s1.charAt(i+1);

            if(ch1 == ch2)

            {

                c++;

            }

        }

        System.out.println("Total number of double letter sequence = "+c);

    }

}