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Full Discussion: C and Perl in unix
The Lounge What is on Your Mind? C and Perl in unix Post 302445202 by Corona688 on Saturday 14th of August 2010 11:45:28 AM
Old 08-14-2010
Quote:
Originally Posted by Deei
Is it like if I dont know C, I cant work on C++ ?
There's a large amount of overlap between C and C++; learning C++ without learning any C would be very tricky. Strangely, and often disastrously, this is the way it is frequently taught anyway. Learn C first, and you'll have an easier time learning and understanding the C++ extensions.

It's hard to say that only legacy applications use C. The entire Linux kernel, the gcc compiler and gnu linker and gdb debugger, the Xorg-X11 window manager, the Apache webserver, the mplayer media player, the GTK windowing toolkit, the Ghostscript renderer, the Samba network file daemon, the OpenVPN network tunneling daemon, Perl + BASH + KSH + PHP + Python + SWIG + TCL + TK are written in C, not C++. MySQL, some big desktop application suites, the KDE window manager, and a few video codecs are C++.

Of course, these are open-source applications where nobody was forced to use any particular language, platform, API, or programming methodology. A C++ API forces you to use C++, a C API will work in either, which is why it's preferable to write libraries in C no matter which you intend to use them with.
Last edited by Corona688; 08-14-2010 at 01:24 PM..
These 3 Users Gave Thanks to Corona688 For This Post:
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LEARN ABOUT DEBIAN

update-java-alternatives

UPDATE-JAVA-ALTERNATIVES(8)				      System Manager's Manual				       UPDATE-JAVA-ALTERNATIVES(8)

NAME

       update-java-alternatives - update alternatives for jre/sdk installations

SYNOPSIS

       update-java-alternatives [--jre] [--plugin] [-t|--test|-v|--verbose]
	     -l|--list [<jname>]
	     -s|--set <jname>
	     -a|--auto
	     -h|-?|--help

DESCRIPTION

       update-java-alternatives  updates  all alternatives belonging to one runtime or development kit for the Java language.  A package does pro-
       vide these information of it's alternatives in /usr/lib/jvm/.<jname>.jinfo.

OPTIONS

       -l|--list [<jname>]
	      List all installed packages (or just <jname>) providing information to set a bunch of java alternatives. Verbose output  shows  each
	      alternative provided by the packages.

       -a|--auto
	      Switch all alternatives of registered jre/sdk installations to automatic mode.

       -s|--set <jname>
	      Set all alternatives of the registered jre/sdk installation to the program path provided by the <jname> installation.

       --jre  Limit the actions to alternatives belong to a runtime environment, not a development kit.

       --jre-headless
	      Limit the actions to alternatives belong to the headless part of a runtime environment.

       --plugin
	      Limit the actions to alternatives providing browser plugins.

       -h|--help
	      Display a help message.

       -t|--test
	      Don't  actually do anything, just say what would be done.  The implementation status of this option is the same as for update-alter-
	      natives (not implemented).

       -v|--verbose
	      Verbose output.

FILES

       /usr/lib/jvm/.*.jinfo
	      A text file describing a jre/sdk installation. Consists of some variables of the form <var>=<value> and a list  of  alternatives	of
	      the form jre|jdk <name> <path>.

AUTHOR

       update-java-alternatives and this manual page was written by Matthias Klose <doko@ubuntu.com>.

								     May 2006					       UPDATE-JAVA-ALTERNATIVES(8)
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