Opening a file

Once a file variable is associated with a particular filename, we can open the file using one of the following procedures:

• reset. This procedure opens a file for reading. It expects at least one parameters. The first parameter (mandatory) is a file variable. The second parameter, if provided, indicates the size of each record. Note that this procedure always places the file pointer to the first byte in the file.
• rewrite. This procedure is similar to reset in terms of expected parameters, but rewrite opens a file for writing and places the file pointer at the first byte. In FreePascal, a reset can follow a rewrite so the file can be both read from and written to.
• append. The procedure is similar to rewrite, but it specifies that the program wants to write starting at the end of the current file.