In the low-level disk I/O disk operation data can not be written as character by character or with
sequence of character as it is carried in the high-level disk I/O functions. In the low-level disk I/O
functions, buffers are used to carry the read and write operations.
Buffer plays an important role in the low-level disk I/O program. The programmer needs to
declare an appropriate buffer size. The low-level disk I/O operations are more efficient and quick
than the high level disk 1/O operations.
a. Opening a fileTo open a file or files open () function is used. This function is defined in"io.h".
The syntax
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