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`getchar'--read a character (macro)

     #include <stdio.h>
     int getchar(void);
     int _getchar_r(void *REENT);
`getchar' is a macro, defined in `stdio.h'.  You can use `getchar' to
get the next single character from the standard input stream.  As a
side effect, `getchar' advances the standard input's current position
   The alternate function `_getchar_r' is a reentrant version.  The
extra argument REENT is a pointer to a reentrancy structure.
The next character (read as an `unsigned char', and cast to `int'),
unless there is no more data, or the host system reports a read error;
in either of these situations, `getchar' returns `EOF'.
   You can distinguish the two situations that cause an `EOF' result by
using ``ferror(stdin)'' and ``feof(stdin)''.
ANSI C requires `getchar'; it suggests, but does not require, that
`getchar' be implemented as a macro.
   Supporting OS subroutines required: `close', `fstat', `isatty',
`lseek', `read', `sbrk', `write'.