Header Files and #include Directives

• These predefined functions are packaged up for you

• There are two parts to this package:

  • the header file which contains the constants, definitions, and functions prototypes
  • the library or object module which contains the actual implementation

• The header file is what is included by issuing the #include directive

• #include <cmath> tells the compiler that to go out and find the file cmath.h and include it

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