ungetc(3s) ungetc(3s) Name ungetc - push character back into input stream Syntax #include <stdio.h> ungetc(c, stream) FILE *stream; Description The routine pushes the character c back on an input stream. That character will be returned by the next call on that stream. The routine returns c. One character of pushback is guaranteed in all cases. The routine erases all memory of pushed back characters. Diagnostics The routine returns EOF if it cannot push a character back. Environment In POSIX mode, the file's EOF indicator is cleared. See Also fseek(3s), getc(3s), setbuf(3s) ungetc(3s)