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Chapter 5. Data Types

5.2.2 Classification of Variables

■ Work Variables

A work variable is intended for general use. You may use it either by declaring with the DIM

statement as a non-array variable or without declaration as an array variable. The following

examples show work variables:

DIM a(10),b%(5),c$(1)

d=100:e%=45

FOR count% = s1% TO s2%

NEXT count%

At the start of a user program, the Interpreter initializes all of the work variables to zero (0) or a

null character string. At the end of the program, all of these variables will be erased.

Upon execution of the

DIM statement declaring an array variable, the Interpreter allocates the

memory for the array variable. The declared array variable can be erased by the

ERASE state-

ment.

■

Common Variables

A common variable is declared by the COMMON statement. It is used to pass its value to the

chained-to programs.

■

A register variable is a unique non-volatile variable supported exclusively by BHT-BASIC. It

will retain its value (by battery backup) even after the program has terminated or the BHT has

been powered off. Therefore, it should be used to store settings of programs and other values

in the memory.

The Interpreter stores register variables in the register variables area of the memory which is

different from the work variables area.

Like other variables, register variables are classified into two types: string variables and

numeric variables, each of which is subclassified into non-array and array types.

The format of register variables is identical with that of general variables. However, you need to

declare register variables including non-array register variables with

DEFREG statements.

BHT-BASIC can handle array variables up to two-dimensional.

In the BHT-5000/BHT-6000/BHT-6500, when starting a user program stored in the flash ROM

for the first time, the Interpreter copies the register variables into the RAM (so that both the

flash ROM and RAM store the register variables). When modifying the register variables, the

Interpreter changes those stored in the RAM.

When uploading a program file stored in the flash ROM by using the

XFILE statement or Sys-

tem Mode, the BHT-5000/BHT-6000/BHT-6500 uploads the program (except for the register

variables in the flash ROM) together with the register variables stored in the RAM.

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