getchar---read a character (macro)#include <stdio.h> int getchar(void); int _getchar_r(void *reent);Description
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 indicator.
The alternate function _getchar_r is a reentrant version. The
extra argument reent is a pointer to a reentrancy structure.
Returns
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)'.
Portability
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.