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GeoBASIC Reference Manual 2.GeoBasic Constructs
TPS1100-Version 1.30 2-11
2.2.3 Declaration of Arrays
An array consists of a fixed number of values of the same type, organised in one or
more dimensions (vector, matrix, three-dimensional array, etc.) and is declared as
follows.
Syntax:
ArrayDeclaration ::= "
TYPE
" "
DIM
" Name SubscriptList "
AS
"
DataType
" END " [ Name ]
DataType ::= ( DataTypeName | "
STRING
" "
*
" Length )
SubscriptList ::= " ( " UpperBound { " , " UpperBound } " ) "
UpperBound ::= IntegerConstant
Length ::= IntegerConstant
•
A variable of type "Name" will consist of an array of as many dimensions as
there are
bounds specified. The upper bounds must be positive integer
constants.
•
Subscripting starts at 1; thus each dimension has "UpperBound" entries. Each
element of the array will be of the data type specified.
•
An individual element is accessed by giving its subscripts (coordinates) as
expressions (see Section 2.4 on Variables).
•
For assignment and parameter passing, the variable may also be used as a
whole. Other operations can only be performed on the individual elements; in
particular, comparison of entire arrays is not possible.
Examples:
♦
Declare a type for an array that contains two integers, and a variable of that
type.
TYPE DIM MyFirstArrayType ( 2 ) AS Integer END
DIM MyFirstArray AS MyFirstArrayType
♦
Now we can access the two components as individual variables.
MyFistArray(1) = 10
MyFistArray(2) = 20
MyFirstArray(1) = MyFirstArray(2) DIV MyFirstArray(1)