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ungetc() Push Character Back onto the Stream
#include <stdio.h>
int ungetc(c,stream);
int c; Character to be pushed
FILE *stream; Pointer to file structure
ungetc() pushes 'c' back onto the named input 'stream'. 'stream' must
be buffered and open for reading. The next call after ungetc() to
getc() or fread() returns 'c'. An attempt to push EOF is ignored.
Returns: The character argument 'c' is returned, if successful.
EOF indicates a failure to push back 'c', or an attempt
to push back a character before any have been read.
Notes: fseek() or rewind() may erase a pushed-back character if
either is called before the character is reread.
-------------------------------- Example ---------------------------------
The following statements open a file, read characters, and push back
the last character read.
#include <stdio.h>
FILE *stream;
int i, ch;
main()
{
if ((stream = fopen("msg.txt","r+")) != NULL) {
i = 0;
while ((ch = getc(stream)) != '@')
buffr[i++] = ch;
ungetc(ch);
fclose(stream);
}
}
See Also:
ungetch()
getc()
putc()
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