Added Coments to MagicalDoors.java

Author: sachin4429

CodeChef/MagicalDoors.java

@@ -31,25 +31,25 @@
 import java.io.*;
 /* Name of the class has to be "Main" only if the class is public. */
 class MagicalDoors
-{
+{   //Main Function
     public static void main (String[] args) throws java.lang.Exception
     {
-        Scanner in = new Scanner(System.in);
-        int t = in.nextInt();
-        while(t>0)
+        Scanner in = new Scanner(System.in); //Scanner for taking input
+        int t = in.nextInt(); //Variable t for no of test case 
+        while(t>0)  //loop for every test case
         {
 
-             StringBuilder str = new StringBuilder(in.next());
-             long res = 0;
-             if(str.charAt(0) == '0')
-             res++;
-             for(int i = 1; i<str.length(); i++)
+             StringBuilder str = new StringBuilder(in.next()); //Taking input int String builder str
+             long res = 0;  //Variabe of long type for storing result
+             if(str.charAt(0) == '0')   //checking the first character of the string (Whether it is 0 or 1)
+             res++;  //if 0 then we are adding 1 to result
+             for(int i = 1; i<str.length(); i++) //for loop starting from 2nd character
              {
-                 if(str.charAt(i) != str.charAt(i-1))
-                     res++;
+                 if(str.charAt(i) != str.charAt(i-1)) //Checking that is the previous charcter same or not
+                     res++; //if not same then adding 1 to result
              }
-             System.out.println(res);
-             t--;
+             System.out.println(res); //printing the result
+             t--; //decrementing the value of t
         }     
     }
 }