What is Number of Unique Letters in String? I received and example of this in a previous post as you can see. Submitted by Sanjay. However things are being used that are not covered in the tutorial. So a detailed explanation would be helpful.
first of all wnat is unique:
unique means, the number of char which is come once is called character,
for Example
in "Avraham"
no of unique char is 4, V R H M.
