Pushes a character back to the input stream, causing that character to be the next character read.

#include <stdio.h>

int ungetc(int c FILE *stream);

#include <wchar.h>

wint_t ungetwc(win_t c, FILE *stream);

Parameters

c

Character to be pushed; must not be EOF/WEOF.

stream

Pointer to FILE structure.

Remarks

Read the next character using getc or getchar. This function fails if it is called more than once before the next read.

ungetwc is the wide-character version of ungetc.

Return Values

A character value

Success.

EOF (ungetc) or WEOF (ungetwc)

Failure.

Generic Text Routines

Requirements