Appendix I

 Prograph Data Types

 t List of Data Types
 t Descriptions

Please also refer to appendix IV, “Syntax and Semantics.”

t	List of Data Types  *517*

boolean
integer
list
macintosh
none
null
real
string
undefined

t	Descriptions  *517*


_______________________________________
boolean  
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Values:   TRUE | FALSE

Description:   Generated by any boolean primitive (for example, <, =, string?), if it has an output. Note that without an output, such an operation either succeeds or fails. 

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integer  *518*
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Values:   from -2,147,483,648 to 2,147,483,647

Description:   The following belong to this type:  

 o  a decimal

 o  any number base (indicated as base#) from 2 to 32

 o  a 1,2,4 byte ASCII

Examples:  	123 | 8#173 | 'a' | 'EQ' | 'STR' 

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list  *518*
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Values:   (<any> ......) with up to 65,535 elements in the interpreter, 4,294,967,295 in the compiler.

Examples:  	() | (a b (c (d))) | (a 123 TRUE)


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macintosh  *518*
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Values:   {vertical horizontal} | {top left bottom right} | <MacType>

Description:   {vertical horizontal} is of type Point and {top left bottom right} is of type Rect. Vertical, horizontal, top, left, bottom, and right are of type integer.

 MacType denotes any supported Macintosh type (such as MacType[@[@]address]).
Examples:  	{1 2} | {20 20 50 50} | WindowRecord@16#13579

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none  *518*
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Values:   NONE

Description:   Generated by Prograph when a terminal with no datalink attached is encountered during execution. This value is not accumulated on a List root of a calling repeat operation.

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null  *519*
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Values:   NULL

Description:   Default value on a newly created attribute, persistent, constant, or match; produced by Prograph search primitive when the search has been unsuccessful.

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real  *519*
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Values:   from -1.1E4932 to 1.1E4932

Description:   The following belong to this type:  

 o  a decimal

 o  an exponential

Examples:   1.2 | 1.80445227 E-1 | 2.0E3

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string  *519*
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Values:   any string of typeable characters, up to 65,535 long in the interpreter, 4,294,967,295 in the compiler.

Examples:   Hello | "This is a string"

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undefined  *519*
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Values:   UNDEFINED

Description:   Generated by Prograph when an operation is skipped during execution.