What is #line used for?

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It is used to include header file with the source code.
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Math

To define a a constant which is accessible through out the program
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B.E.

# is used for pre-processor directive i.e, to include header(precompiled), and define macro( to use the name as is). In both case, it not compiled while compiling the source but used at run time as it is.
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# is used in starting, to include pre compiled files in program such as studio.h.
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