You need the program Xcode which is on one of the Leopard install disks. If you want to make a new C-Application, select "new Project" then "console application" then "standard application".
Mac OS X is written in the programming languages C and Objective C.
If it is a G4 iBook produced after 2002 it may not be able to run Mac OS 9 separately. Mac OS X 10.4 (Tiger) uses the Classic Environment which runs Mac OS 9 within Mac OS X. There will be a Classic option in the System Preferences where you can verify that the Mac OS 9 System Folder is available. Double clicking a Mac OS 9 application should launch the Classic Environment. If this does not happen then: If you have a boxed retail version you can reinstall Mac OS 9 by inserting the Mac OS 9 disc, restating the computer and holding down the C key while it starts up. This will boot the computer from the Mac OS 9 CD rather than the hard disc. Open the Installer, Click the Options button and then tick the Clean Install option. Install Mac OS 9. Or: If you have Mac OS 9 on a Restore disc that came with the computer Open Software Restore and select Restore Mac OS 9 Only. If the computer originally had an earlier version of Mac OS X and is now no longer compatible with the original Restore disc you can download an updated version from the Apple support site (See links below) by clicking the Accept And Download link at the bottom of the page.
I'm not sure if you mean the foundation of Mac OS X itself, or of the desktop. The desktop is a part of Mac OS X's Finder application which is written by Apple from scratch in Objective-C using the Cocoa framework. Mac OS X itself's core is Darwin, a UNIX operating system based on the open source FreeBSD.
unix.
Learn a programming language, most preferably C or C++, because those are the languages most commonly used to write applications. C and C++ programs can also run on *nix systems (UNIX, Linux, etc).
Mac OS X is mostly written in Objective C utilising Apple's Cocoa frameworks (See links below). Some core aspects of the system are written in C. probably objective-C ... which is mac's version of C++ - which other opperating systems (and everything else) is written in ... and C of course, which is an older version of C++. Though if you want to be technical, that code has to be compiled into Assembly language and or machine code - which the processor understands.
Skype was written in a few different programming languages:Embarcadero DelphiObjective-C (iOS, Mac OS X)C++ with Qt4 (Linux)
Just about any language can be used to programme applications for Mac OS X which was itself mostly written in C and Objective C. Apple supplies their XCode developers tools with every Mac which supports C, C++, Objective C, Objective C++, Java, AppleScript, Python and Ruby. Third parties have added support for Pascal, Ada, C#, Perl, Haskell, and D to XCode and there are numerous other options such as Real Studio and Live Code etc.
Put in the installation disk, and restart your Mac. Once your screen goes black, hold C. It should launch the installer.
You would need Mono/C#
Different for every C program. For example, linux is an OS-kernel, whilst Apache is a web-server.
Copy:Ctrl+C in Windows (meaning "press CTRL key and C key simultaneously")Cmd+C on Mac OS XOn Linux, it varies with the program.Paste:Ctrl+V in WindowsCmd+V on Mac