Write the functions and syntax of the following commands in file handling.

I. OPEN

It is used to open a file or a device.

Syntax:

It has two syntaxes

• OPEN "file mode", #Fileno., "data file name"
• OPEN "data file name" FOR modeName AS #fileno.

Example

• OPEN "O", #1, "STUDENT.DAT"
• OPEN "STUDENT.DAT" FOR OUTPUT AS #1

II. WRITE#

It is used to write data into a file or a device.

Syntax:

• Write #Fileno. , <list of variables>

Example

• WRITE #1, NAM$, CLASS, ROLL, SEC$

III. INPUT#

It is used to read data from a data file.

Syntax:

• INPUT #FileNo., <list of variables>

Example

• Input #1, NAM$, CLASS, ROLL, SEC$

IV. LINE INPUT#

It is used to read data from a data file using a string variable. It is similar to the INPUT# statement but it reads the entire record buffer using a string variable instead of a list of variables.

Syntax:

• LINE INPUT #Fileno., string variable

Example

• LINE INPUT #1, RECO$

V. CLOSE

It is used to close all opened files.

Syntax:

• CLOSE [#Fileno.1, #Fileno.2,......#File no "n"]

Example

• CLOSE #1...Closes only single file with #1
• CLOSE #1,#2...Closes both #1 and #2 files.

VI. EOF()

It means End of file. It is used to check the end of file position in the data file.

Syntax:

• EOF (Fileno.)

Example

• If EOF (1) THEN CLOSE #1

VII. PRINT#

It is similar to WRITE# statement. It writes data into the file without the delimiters. Thus, the output differs from WRITE# statement.

Syntax:

• PRINT #Fileno., <list of variables>

Example

• PRINT #1, NAM$, CLASS, ROLL, SEC$