I am a little confused regarding three facts ,firstly I went through the below article ,there it is mentioned that identation is implemented using tabs and when I read another articles there it is mentioned that both the tabs and spaces are used for identation so actually how is identation implemented.
http://mrbool.com/importance-of-code-indentation/29079
Secondly which one should be preffered,in one article it is mentioned that it is advantageous that tab have their own spaces according to their environment while others considered it to be a disadvantage ,so which one is more suitable tabs or spaces.
Thirdly ,does the size of the code file increase if more tabs or spaces are used in the c code.I checked it out ,found no change but I read it in one article.