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In most versions of C++, including Turbo C++,each standard library has a header file that contains function prototypes for the functions used in those libraries and data type and constant definitions, needed by those functions. Microsoft seems to be phasing these out. Basic header files include iostream.h, conio.h and math.h.

When declred in a program they are usually at the top, before any functions are used, depending on your programing practices, and will look like this

#include < stdio.h >

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