ungetc() -- STDIO Function (libc)

Return character to input stream
#include <stdio.h>
int ungetc (c, fp)
int c; FILE *fp;

ungetc() returns the character c to the stream fp.  c can then be read by a
subsequent call  to getc(), gets(),  getw(), scanf(), or  fread().  No more
than one character  can be pushed back into any  stream at once.  A call to
fseek() will nullify the effects of a previous ungetc().

ungetc()  normally returns  c. It  returns EOF if  the character  cannot be
pushed back.

Example

For an example of this function, see fgetc().

See Also

fgetc(),
getc(),
libc
ANSI Standard, §7.9.7.11
POSIX Standard, §8.1

© 2012 by Stephen A. Ness