#include <iostream.h>
It makes the compiler to include the text of
the named file in the program at this point.
The file iostream.h is a system supplied
file which has definitions in it which are
required if the program is going to use
stream input or output. All your programs
will include this file.
conio.h is a C
header file used in old MS-DOS compilers to
create text user interfaces
cout
is the name of the standard output stream in
C++, and the meaning of the entire statement
is to insert a sequence of characters into
the standard output stream.
cout is declared in the iostream standard
file .
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