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typedef struct {
int level; /* fill/empty level of buffer */
unsigned flags; /* File status flags */
char fd; /* File descriptor */
unsigned char hold; /* Ungetc char if no buffer */
int bsize; /* Buffer size */
unsigned char _FAR *buffer; /* Data transfer buffer */
unsigned char _FAR *curp; /* Current active pointer */
unsigned istemp; /* Temporary file indicator */
short token; /* Used for validity checking */
} FILE; /* This is the FILE object */
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fseek() ÔÚÁ÷Öж¨Î»µ½Ö¸¶¨µÄ×Ö·û 
fputs() д×Ö·û´®µ½Á÷ 
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rewind() ¸´Î»Îļþ¶¨Î»Æ÷µ½Îļþ¿ªÊ¼´¦ 
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fwrite() ÏòÁ÷ÖÐдָ¶¨¸öÊýµÄ×Ö·û 
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