Before we can start programming in C we'll need to install a couple of things, and set up our environment so that we have everything we need.
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Because C is such a universal language this should hopefully be fairly simple. Essentially we need to install two main things.
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A text editor and a compiler. On Linux the text editor I recommend is gedit. Whatever other basic text editor comes installed with your distribution will also work well. If you are a Vim or Emacs user these are fine to use. Please don't use an IDE. It isn't required for such a small project and won't help in understanding what is going on.
On Mac a simple text editor that can be used is TextWrangler. If you have a different preference this is fine, but please don't use XCode for text editing. This is a small project and using an IDE won't help you understand what is going on. If you have another preference this is fine. Please don't use Visual Studio as it does not have proper support for C programming.
If you attempt to use it you will run into many problems. The compiler is a program that transforms the C source code into a program your computer can run. The installation process for these is different depending on what operating system you are running. Compiling and running C programs is also going to require really basic usage of the command line. This I will not cover, so I am going to assume you have at least some familiarity with using the command line. If you are are worried about this then search for online tutorials on using it, relevant to your operating system.
On Linux you can install a compiler by downloading some packages. If you are running Ubuntu or Debian you can install everything you need with the following command sudo apt-get install build-essential. If you are running Fedora or a similar Linux variant you can use this command su -c "yum groupinstall development-tools". On Mac you can install a compiler by downloading and installing the latest version of XCode from Apple. If you are unsure of how to do this you can search online for "installing xcode" and follow any advice shown.
You will then need to install the Command Line Tools. On Mac OS X On versions of Mac OS X prior to On Windows you can install a compiler by downloading and installing MinGW. If you use the installer at some point it may present you with a list of possible packages. Make sure you pick at least mingwbase and msys-base. Once installed you need to add the compiler and other programs to your system PATH variable.
You can create this variable if it doesn't exist. You may need to restart cmd. This will allow you to run a compiler from the command line cmd. It will also install other programs which make cmd. If you get some information about the compiler version echoed back then it should be installed correctly. You are ready to go! If you get any sort of error message about an unrecognised or not found command, then it is not ready.
You may need to restart the command line or your computer for changes to take effect. On some systems such as Windows the compiler command might have a different name such as gcc. Try this if the system cannot find the cc command. Now that your environment is set up, start by opening your text editor and inputting the following program. This is your first C program!
In the first line we include what is called a header. This statement allows us to use the functions from stdio.
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One of the functions from this library is the puts function you see later on in the program. Next we declare a function called main. All C programs must contain this function. All programs start running from this function.
Installing the environment
Inside main the puts function is called with the argument "Hello, world! This outputs the message Hello, world! The function puts is short for put string. X on this course - older versions will work but may result in you hitting some errors, especially when you get used to the language and start using different packages. If you already have python, take a look here. If not, then follow the instructions below:. Once you are done installing the software listed above, please go to this page , which has instructions on how to test that everything has been installed correctly.
Your account will be vital to the course on version control. If you are new to using the terminal, please have a run through this excellent crash course to get familiar with things - this if from the Learn Python The Hard Way site which is also worth a look through. If you are new to the terminal, you may occasionally ask yourself where you have ended up and in some cases, how to leave a certain location.
This page offers some useful tips and advice - please have a look through this before attending the course. Setting up your machine Setting up your machine Before attending the DTP Python training course, there are a few preliminary steps that you must first take. These will result in: local installation of a bash prompt terminal local Python installation using the Anaconda distribution initiation of a Github user account installation of an appropriate text editor Program installation Bash shell Windows Download the Git for Windows installer.
This will provide you with both Git and Bash in the Git Bash program. Linux The default shell is usually Bash, but if your machine is set up differently you can run it by opening a terminal and typing bash. Git Git is a version control system that lets you track who made changes to what when and has options for easily updating a shared or public version of your code on github. Windows Git should be installed on your computer as part of your Bash install described above. Windows notepad is your go to editor and is accessed by simply typying notepad in your terminal - to keep things simple, you can just use this.
Mac OS X If you already have an editor you like to use to work on text files, then please use that for the course.
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It should be pre-installed. Linux If you already have an editor you like to use to edit text files, then please use that for the course - your choice between Emacs and Vim is a decision for you alone! Python Python is a popular language for scientific computing, and great for general-purpose programming as well. Windows If you already have python, take a look here. Click on Python 3. X link. Download this Python 3 installer. Install Python 3 using all of the defaults for installation except make sure to check Register Anaconda as my default Python 3.
Mac OS X If you already have python, take a look here.
How to run gedit on OS X Mavericks | utelunujybil.tk
Install Python 3 using all of the defaults for installation. Linux If you already have python, take a look here. Click on the Python 3. Download this Python 3 installer, save it in your home folder. Installation requires using the shell. Open a terminal window. Type bash Anaconda- and then press tab.
The name of the file you just downloaded should appear. Press enter.