Headers

Each of the previous examples in the chapter consists of a single .cpp file, also known as a source-code file, that contains a GradeBook class definition and a main function. When building an object-oriented C++ program, it’s customary to define reusable source code (such as a class) in a file that by convention has a .h filename extension—known as a header. Programs use #include preprocessing directives to include headers and take advantage of reusable software components, such as type string provided in the C++ Standard Library and user-defined types like class GradeBook.

Our next example separates the code from Fig. 3.7 into two files—GradeBook.h (Fig. 3.9) and fig03_10.cpp (Fig. 3.10). As you look at the header in Fig. 3.9, notice ...

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