Campbell CR800 Especificações descarregar pdf (Página 113)

Section 5. Program Declarations

5-3

Const

Declares symbolic constants for use in place of numeric entries.

Syntax

Const constantname = expression

Remarks

The Const statement has these parts:

Part Description

constantname Name of the constant.

expression Expression assigned to the constant. It can consist of

literals (such as 1.0), other constants, or any of the

arithmetic or logical operators.

Tip Constants can make your programs easier to modify. Unlike

variables, constants can't be changed while your program is

running.

Caution Constants must be defined before referring to them.

Const Declaration Example

The example uses Const to define PI.

Const PI = 3.141592654 'Define constant.

Dim Area, Circum, Radius 'Declare variables.

Radius = Volt( 1 ) 'Get measurement.

Circum = 2 * PI * Radius 'Calculate circumference.

Area = PI * ( Radius ^ 2 ) 'Calculate area.

Dim

Declares variables and allocates memory for the variables. In CRBasic, ALL

variables MUST be declared.

Syntax

Dim varname[([subscripts]) [, varname[([subscripts])]]

Remarks

The Dim statement has these parts:

Part Description

varname Name of a variable.

subscripts Dimensions of an array variable. You can declare multiple

dimensions.

The argument subscripts has the following syntax:

size [size, size]

In CRBasic the lowest number in a dimension is 1 not 0.

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Campbell CR800 Especificações Página 113