PREPROCESSORS
The preprocessors are the directives, which give instructions to
the compiler to preprocess the information before actual
compilation starts.
All preprocessor directives begin with #, and only white-space
characters may appear before a preprocessor directive on a line.
Preprocessor directives are not C++ statements, so they do not
end in a semicolon (;).
You already have seen a #include directive in all the examples.
This macro is used to include a header file into the source file.
There are number of preprocessor directives supported by C++ like
#include, #define, #if, #else, #line, etc. Let us see important directives:
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