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29.	Is pointer arithmetic a valid one?
	Pointer arithmetic is not valid one. Pointer addition, multiplication and division are not allowed as these are not making any sense in pointer arithmetic.
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30.	When can void pointer and null pointer be used in C?
	Void pointer is a generic pointer that can be used to point another variable of any data type. Null pointer is a pointer which is pointing to nothing.
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31.	Is it possible to create your own header files?
	Yes, it is possible to create a customized header file. Just include in it the function prototypes that you want to use in your program, and use the #include directive followed by the name of your header file.
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32.	A program can contain more return statements?
	Yes. The program can contain any number of return statements.
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