title: Can we switch between ASCII and Unicode
body: <p>I came across "char variable is in Unicode format, but adopts / maps well to ASCII also". What is the need to mention that? Of course ASCII is 1 byte and Unicode is 2. And Unicodeitself contains ASCII code in it (by default - its the standard). So are there some languages in which a <code>char</code> variable supports UNICODE but not ASCII? </p>
  
  <p>Also, the character format (Unicode/ASCII) is decided by the platform we use, right? (UNIX, Linux, Windows etc). So suppose my platform used ASCII, is it not possible to switch to Unicode or vice-versa?</p>