By the way, did you notice Emacs doing anything unusual when you added your new variable declarations to the squatter program?
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As an experiment, go into the ``joints.c'' buffer and add the following declaration to the program. Watch carefully what happens when you enter the return following the semicolon at the end of the line.
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Emacs has many more features that make it easier for you to write C programs. There are so many features that we don't have the time to talk about all of them here. If you're curious, pay close attention to what happens as you edit.