ferror, feof, clearerr, ungetc
Function Prototype
int ferror(FILE *fp);
int feof(FILE *fp);
void clearerr(FILE *fp);
int ungetc(int c, FILE *fp);ferror
If buffer I/O stream occur error, then return error flag (non-zero), 0 otherwise
feof
Return non-zero if EOF reached, 0 otherwise
clearerr
- Clear both error flag and EOF flag for the given file stream
- Useful when we want continue reading/writing after handling error
ungetc
Function
- “push back” a character to the input stream
- The character we push back stored in the buffer
- The next read operation will receive this pushed-back character first
Remark
- The character we push back doesn’t have to be the same one we just read
- No pushing back EOF
- Clears EOF flag when called