Sharp MZ-700 Bedienungshandbuch PDF herunterladen (Seite 12)

• Data file control

There are two types of data files, depending upon the format of file access (the method

of data read-out and write-in).

One is called the sequential access

file

and the other

called the random access file.

With the sequential access file, the file data

access

treated as one sequential block.

The

file

name

specified for one group of data, and such data are accessed

order

from the heading at the time of registration

read-out of the file.

For the random access file on the other hand, the filed data are accessed at random.

One random access file is composed of one data group designated

its own

file

name. Each group of data

registered

the

file

a parallel arrangement, and

write-in and read-out of each data group

possible

using the number (expression)

assigned to that data.

If,

for example, a collection of certain data can be handled

a connected group (such

as, for example, data consisting of a series of decimal expressions used when producing

machine language programs by BASIC

POKE command and elements of tables that

can be presented in order from the heading, etc.), collection of such data

sequential access

file

can be useful and effective. The registration of data

a random

access file, on the other hand, can be useful when it

necessary to not only consider

the group of overall data but to read-out and/or write-in each element (when it

necessary, for example, to rewrite data or to search, arrange, delete, etc.).

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