Simpler applications such as filter utilities are fun and rewarding to write in C. This would be anything that takes input (perhaps on stdin), transforms it in some way, and prints the output.
Something more advanced would be a networking application. Code up a TCP client or server and begin to write some code that communicates over a socket. Fun stuff. This kind of thing is easy to test as you either write the client or server and then use netcat, nc to do the other side.
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Simpler applications such as filter utilities are fun and rewarding to write in C. This would be anything that takes input (perhaps on stdin), transforms it in some way, and prints the output.
Something more advanced would be a networking application. Code up a TCP client or server and begin to write some code that communicates over a socket. Fun stuff. This kind of thing is easy to test as you either write the client or server and then use netcat,
ncto do the other side.