file that includes the first file as this would also result in an infinite recursion.
15. Header files can contain any text at all. They may also contain C code to define structure
templates, global variables, or function definitions. However, header files usually do not
contain function definitions as it is more efficient to store these in the function libraries set up
by the user. But global variables are sometimes included.
16. If
iostream.h
is included in the program, the macro versions (to be discussed later) are used.
On the other hand, if the programmer wishes to use the function versions they can be undefined
after the
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