How to use xcode to compile standard C prgram

Hi all,
I am a new developper in xcode. I have several standard C programs written by myself before.
I have problem to open them with the new xcode (4.1 i guess). If I drag the program folder to xcode icon, nothing happens. I noticed through xcode I can start a new project or workspace, then I can add my program to it.
However, problem still exists. e.g. my program contains several files (*.c *.h), if I select one variable and select go to the definition of it, xcode cannot find the definition.
Besides I cannot debug neither run the program in xcode.
Normally I compile my codes with gcc or icc in terminal, but now I am totally lost in xcode. I know my questions sound silly, hope some guys can help me out of it and I will appreciate a lot.
Mono

First, if you normally compile your code in the Terminal, you can keep doing that. You don't have to use Xcode.
In Xcode 4 every program requires a project, even simple command-line programs. Create a command-line tool project. Choose File > New > New Project to create a new project. Select Application under Mac OS X on the left side of the New Project Assistant. Select Command Line Tool from the list of application projects. Click the Next button. Choose C from the Type menu. Name the project. Click the Next button. Select a location to save the project and click the Create button.
After creating your project, add your source code files to the project. Choose Files > Add Files to ProjectName to add the files to your project. You may need to delete the main.c file Xcode created when you created the project.
If you want to debug your project, click the Breakpoints button in the project window toolbar. Click the Run button in the toolbar to build and run your project. If you click the Breakpoints button, your program will run in the debugger. If you don't see the debug area at the bottom of the project window when running your program, choose View > Debug Area > Show Debug Area to show it. You need the debug area open to do command-line input and output in Xcode.

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