How to Compile a C Program Using the GNU Compiler (GCC)

1. In order to see if you have the GNU C/C++ compiler installed on your system
   • Type/Copy/Paste: gcc --version
   • If the command is not found, it is likely that gcc/g++ isn't installed.
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   Install gcc/g++ on your system, consult your Unix or GNU/Linux distribution documentation for the appropriate installation method. If you are using Microsoft Windows, please see the following installation method used to install MinGW GNU C/C++ compiler for Microsoft Windows How to install MinGW( Minimalist GNU C/C++ Compiler) on Microsoft Windows
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   First, create a working directory using the following command:
   • Type/Copy/Paste: mkdir CCPP
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   Second, change into the directory
   • Type/Copy/Paste: cd CCPP
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   Third, use a text editor such as nano, gedit, vi, notepad,(on Microsoft Windows ) for example,
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   Unix/GNU/Linux Instructions:
   • Type/Copy/Paste: nano main.c
   • Type/Copy/Paste: gedit main.c
   • Type/Copy/Paste: vi main.c
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   Windows Instructions:
   • Type/Copy/Paste: notepad main.c
   • You can use notepad as a text editor on Microsoft Windows
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   Enter the following source code below:
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   Type/Copy/Paste:
   • #include
   • #include
   • int main()
   • {
   • printf("Hello World\n");
   • return(0);
   • }
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    Once this task is complete save the source code as a text file in your editor asmain.c
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    Fourth, compile the file by issuing the following command
    • Type/Copy/Paste:
    • gcc main.c -o HelloWorld
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    Fifth, run the command by issuing the following command
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    Unix/GNU/Linux instructions:
    • Type/Copy/Paste: ./HelloWorld
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    Microsoft Windows Instructions:
    • Type/Copy/Paste: HelloWorld.exe
    • On Windows when the HelloWorld.c file is compiled it will usually have an .exe extention.
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    To compile multiple files:
    • Type/Copy/Paste:
    • gcc -o outputfile file1.c file2.c file3.c
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    To compile with more error checking using the -Wall tag:
    • Type/Copy/Paste:
    • gcc -Wall -o outputfile file1.c
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    To compile files without linking them:
• Type/Copy/Paste:
• gcc -c file1.c file2.c file3.c
• After the last step, if you want to link them, type: gcc -o outputfile file1.o file2.o file3.o

Thanks to:

http://www.cyberciti.biz/faq/compiling-c-program-and-creating-executable-file/