![]() ![]() The second statement inside the function is return 0. The function puts is short for put string. This outputs the message Hello, world! to the command line. Inside main the puts function is called with the argument "Hello, world!". All programs start running from this function. All C programs must contain this function. This function is declared to output an int, and take as input an int called argc and a char** called argv. One of the functions from this library is the puts function you see later on in the program. This statement allows us to use the functions from stdio.h, the standard input and output library which comes included with C. In the first line we include what is called a header. This may initially make very little sense. Create a directory where you are going to put your work for this book, and save this file as hello_world.c. Now that your environment is set up, start by opening your text editor and inputting the following program. Try this if the system cannot find the cc command. On some systems (such as Windows) the compiler command might have a different name such as gcc. You may need to restart the command line or your computer for changes to take effect. ![]() 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. If you get some information about the compiler version echoed back then it should be installed correctly. ![]() To test if your C compiler is installed correctly type the following into the command line. It will also install other programs which make cmd.exe act like a Unix command line. This will allow you to run a compiler from the command line cmd.exe. You may need to restart cmd.exe for the changes to take effect. You can create this variable if it doesn't exist. To do this follow these instructions appending the value C:\MinGW\bin to the variable called PATH. Once installed you need to add the compiler and other programs to your system PATH variable. On Windows you can install a compiler by downloading and installing MinGW. On versions of Mac OS X prior to 10.9 this can be done by going to XCode Preferences, Downloads, and selecting Command Line Tools for Installation. On Mac OS X 10.9 this can be done by running the command xcode-select -install from the command line. You will then need to install the Command Line Tools. ![]() If you are unsure of how to do this you can search online for "installing xcode" and follow any advice shown. On Mac you can install a compiler by downloading and installing the latest version of XCode from Apple. If you are running Fedora or a similar Linux variant you can use this command su -c "yum groupinstall development-tools". If you are running Ubuntu or Debian you can install everything you need with the following command sudo apt-get install build-essential. On Linux you can install a compiler by downloading some packages. If you are are worried about this then search for online tutorials on using it, relevant to your operating system. This I will not cover, so I am going to assume you have at least some familiarity with using the command line. The installation process for these is different depending on what operating system you are running.Ĭompiling and running C programs is also going to require really basic usage of the command line. The compiler is a program that transforms the C source code into a program your computer can run. If you attempt to use it you will run into many problems. Please don't use Visual Studio as it does not have proper support for C programming. If you have another preference this is fine. On Windows my text editor of choice is Notepad . This is a small project and using an IDE won't help you understand what is going on. If you have a different preference this is fine, but please don't use XCode for text editing. On Mac a simple text editor that can be used is TextWrangler. It isn't required for such a small project and won't help in understanding what is going on. If you are a Vim or Emacs user these are fine to use. Whatever other basic text editor comes installed with your distribution will also work well. On Linux the text editor I recommend is gedit. Text EditorĪ text editor is a program that allows you to edit text files in a way suitable for programming. Essentially we need to install two main things. Because C is such a universal language this should hopefully be fairly simple. 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. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |