get next character or word from input
function obtains the next input character (if present) from the stream
pointed at by stream, or the next character pushed
back on the stream via ungetc(3).
function acts essentially identically to
but is a macro that expands in-line.
function is equivalent to
getc() with the argument
function obtains the next int (if present) from the
stream pointed at by stream.
If successful, these routines return the next requested object
from the stream. If the stream is at end-of-file or a
read error occurs, the routines return
routines feof(3) and ferror(3) must be used to distinguish between end-of-file and
error. If an error occurs, the global variable errno
is set to indicate the error. The end-of-file condition is remembered, even
on a terminal, and all subsequent attempts to read will return
EOF until the condition is cleared with
ferror(3), fopen(3), fread(3), getwc(3), putc(3), ungetc(3)
functions conform to ANSI X3.159-1989
getw() functions first appeared in
Version 1 AT&T UNIX;
getchar() in Version 2
AT&T UNIX; and
Version 7 AT&T UNIX.
Dennis Ritchie originally implemented
getw() in PDP-11
EOF is a valid integer value,
must be used to check for failure after calling
Since the size and byte order of an int may
vary from one machine to another,
getw() is not
recommended for portable applications.