How to write Test Cases for C Language Functions

Can anyone please let me know How to write Test Cases for C Language Functions.
Are there any good websites which can provide good info on this.

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Suhas .QA ManagerCommented:
For C language functions, you need to write the test cases accoring to the code coverage analysis.

i.e., functional coverage, line coverage, brach coverage etc...

Please go through :

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Are you looking for unit level test case?
If so you may need unit test frame work. Variety of frame works available for C language
Cunit ,CuTest ,SimplecTest etc:
I suggest this is the best way.
Additionally these points may help you when writing Test cases for C.
-      Since C is a procedural level programming language, there is verity of functions available.
Testing is depends on the way you are testing and the requirement of your test.
For ex:
If you test a few branches up from the leaves that makes you component testing
-      Depends on your branch functions , you may even lead to system testing once you have stated to perform unit testing
Please feel free to post me back for further information.
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