Files

File

• Computer programs store data that will be required again in a file.
• Every file is identified by its filename.
• Text files contain a sequence of characters.
• Text files can include an end of line character that enables the file to be read from and written to as lines of characters.

OPENFILE <file identifier> FOR <file mode>
READFILE <file identifier>, <variable>
WRITEFILE <file identifier>, <variable>
EOF(<file identifier>)
CLOSEFILE <file identifier>

DECLARE textLn : STRING
DECLARE myFile : STRING
myFile ← "myText.txt"
OPENFILE myFile FOR WRITE
REPEAT
      OUTPUT "Please enter a line of text"
      INPUT textLn
      IF textLn <> "" THEN
            WRITEFILE myFile , textLn
      ELSE
            CLOSEFILE myFile
      ENDIF
UNTIL textLn = ""
OUTPUT "The file contains these lines of text:"
OPENFILE myFile FOR READ
REPEAT
      READFILE myFile, textLn
      OUTPUT textLn
UNTIL EOF(myFile)
CLOSEFILE myFile

File

Which one is wrong for file operation?

A.

READFILE "a.txt", File

B.

WRITEFILE "a.txt", File

C.

EOF("a.txt")

D.

CLOSEFILE "a.txt"

E.

OPENFILE "a.txt" FOR OPEN

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