User`s guide

Variable Initialization

Before a variable can be used it must be initialized. String and numeric variables can be

initialized by placing them on the left side of an assignment statement. The statements:

var_one = 36

$var_two = "two"

initializes the variables var_one and $var_two.

var_one = var_two

initializes var_one if var_two has already been initialized. Otherwise, an undefined value

error is returned. A variable can never be initialized on the right side of an assignment

statement (var_two could never be initialized by the above statement).

The statement:

var_one = var_one + 10

is valid only if var_one has been initialized in a previous statement.

Strings, numeric variables, and location variables can be initialized by being loaded from a disk

file.

Strings and numeric variables can be initialized with the PROMPT instruction.

Transformations and precision points can be initialized with the SET or HERE program

instructions. They can also be initialized with the HERE and POINT monitor commands or with

the TEACH monitor command and the manual control pendant. See the V+ Operating

System Reference Guide for information on monitor commands.

Unless the program has declared a LOCAL or AUTO variable with the same name.

Variable Classes

V+Language User's Guide, v17.0

Page 110