Trigraphs & entry

From: Vijay Kumar R Zanvar (vijaykumar.rz_at_globaledgesoft.com)
Date: 11/04/03 

Date: Tue, 4 Nov 2003 09:52:03 +0530

I have following questions:

    1. Appendix C of K&R says:
            Trigraph sequences introduced by ?? allow
            representation of characters lacking in some
            character sets. ...

       Can somebody explain how trigraphs are used?

    2. What `entry' keyword was used for?

    3. How to support colored output in C? For example,
       Turbo C/C++ provides textattr () and textcolor ()
       library routines to support it.

Thanks.