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21.	Why C language being considered a middle level language?
	This is because C language is rich in features that make it behave like a high level language while at the same time can interact with hardware using low level methods. The use of a well structured approach to programming, coupled with English like words used in functions, makes it act as a high level language. On the other hand, C can directly access memory structures similar to assembly language routines.
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22.	What are the pre-processor directives?
	Macro inclusion Conditional inclusion File inclusion
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23.	What is the difference between auto variable and register variable in C?
	Storage class of all variables is auto by default unless we specify a variable is register or static or extern in C program. Register variables will be accessed very faster than the normal/auto variables. Since they are stored in register memory rather than main memory. But only limited variables can be used as register since register size is very low. (16 bits, 32 bits, or 64 bits).
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24.	What are library functions?
	Library functions are a collection of predefined functions. They are stored in files with extension lib. These functions are shipped with the compiler for the convenience of the programmers.
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