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Click on the Install button that is next to Command Line Tools.

Youve registered for a course, you have your texts and manuals, and youve fired up your trusty Mac.

This is exciting You think you are all set, and then it hits: they want you to have a compiler.

What the heck is that Well explain this and help you to get a C compiler for Mac up and running on your computer.

If you are relatively new to the Mac, you can develop your skills with a course on getting started with a Mac.

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You feed your source code in to the compiler and it will either give you an executable program or a long list of error codes telling you why it couldnt make the program.

It is meant for humans and is the same on any operating system.

The compiler, on the other hand, has to be specific for the operating system where the program will run.

The executable program can be distributed without the source code, which makes it harder for anyone to steal the programming ideas that went into the program.

A disadvantage of compilers is that the compiling step adds time to the development process because the whole program must be compiled each time a change is made.

You will have to register as an apple developer to get access to these tools.

In order to do these installs, you will be using Terminal to work at the command line.

Get a solid foundation on the Mac command line with this course.

An IDE allows you to write, compile, and debug a program from one central interface.

All of the install methods involve first getting Xcode, then making the gcc compiler available outside of Xcode, and then installing a newer version of gcc.

This will give you a working version of gcc, but it is an older version.

If you want or need a more up to date version, that is available at High Performance Computing for Mac OS X.

The files must be unzipped and installed at the command line.

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After that, you will need to update your Shell resource file so that the newer versions are used.

Details can be found at Installing the GNU compilers on Mac OS X.

It is free, but you need to supply credit card information in order to have an App Store account.

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For Xcode 4.2, what you download from the App Store is an installer, which you then run.

For Xcode 4.3, it is installed automatically, but it does not have gcc in the correct location.

To finish the job, start Xcode and go to Preferences, Downloads, Components.

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