Please try and give better titles for quicker response. Also that helps in more people actually reading your threads. I have edited the title for you as of now.

Now about your query.

Quote:
Originally Posted by falcon eyes
what's meant by "Unicode characters",
Unicode characters mean A 16-bit character encoding scheme allowing characters from lots of other languages like Arabic, Hebrew, Chinese, Japanese, to be encoded in a single character set.
Quote:
Originally Posted by falcon eyes
how to know the type of character i use in my projet
Let us know what compiler you are using to compile your code as well. In VS you may be using the char data type as something like _TCHAR or _WCHAR and that means it could be a Unicode compatible code and then you need to see the project setting to see if it is using the Unicode compilation command line.

Also your main will be a bit different but I don't remember what it is right now