@NogDogSep 20.2013 — #Because you can treat a string sort of like an array of characters, and since it's a zeroth based array, index 4 is the 5th character.
@priyankagoundSep 26.2013 — #This is because you are using array. array[4] means it starts from '0' and then continue till '4' which total is '5' numbers. So the in word "print" it will count form '0' and will print the 5th character as in the array you have mentioned [4].
