Preprocessor directive
Why we need preprocessor directive #include?
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Satyapriya NayakPosted Feb 1, 2012, 12:22 AM
Preprocessor directives are lines included in the code of our programs that are not program statements but directives for the preprocessor. These lines are always preceded by a hash sign (#). The preprocessor is executed before the actual compilation of code begins, therefore the preprocessor digests all these directives before any code is generated by the statements.
#include
tells the compiler that we want to use the iostream library.
Refer
http://en.wikipedia.org/wiki/Iostream
Thanks