What is the use of # in C language?

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Ravi Kumar

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its uses for macros
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Tutor

For include header Libraries, for example #include stdio.h
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IT Professional

It is used for sending instructions (some also called macros) to the pre-processor. Examples include #include, #define, #if etc.
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Computer Science Faculty

It is an indication to the compiler that it is a preprocessor directive statement which will be processed before compilation
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