Declaration:
int ungetc(int char,
FILE *stream);
Pushes the character char (an unsigned char)
onto the specified stream so that the this is the next character
read. The functions fseek, fsetpos,
and rewind discard any characters pushed
onto the stream.Multiple characters pushed onto the stream are read in a FIFO
manner (first in, first out).
On success the character pushed is returned. On error
EOF is returned.
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