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Dim c(10) As Integer
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defines an eleven-element integer array consisting of the data items c(0), c(1), c(2), . . ., c(10). However, the specification of a different lower limit can also be included within a Dim statement (or a Public or Private statement). In this case, the general form of the Dim statement is
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Dim array name ( subscript 1 lower limit To subscript 1 upper limit, subscript 2 lower limit To subscript 2 upper limit, etc.) As data type Public and Private statements are written in the same manner.
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EXAMPLE 8.1
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A Visual Basic module includes the following array declarations.
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DIM Customers(200) As String, Net(100) As Single, Sales(1 To 50, 1 To 100) As Single
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This statement defines Customers to be a one-dimensional string array containing 201 elements, ranging from Customers(0) to Customers(200). Similarly, Net is a one-dimensional, single-precision array containing 101 elements, and Sales is a two-dimensional, single-precision array containing 5,000 elements (i.e., 50 rows and 100 columns; 50 100 = 5,000).
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In some applications, it is more natural to use arrays whose subscripts begin at 1 rather than 0. Thus, a one-dimensional, n-element array will range from 1 to n rather than 0 to n a more natural selection for many
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ARRAYS
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[CHAP. 8
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programmers. The Option Base statement allows the lower limit for all arrays within a module to be changed to 1. This statement is written simply as
Option Base 1 Option Base must appear at the module level (not within a procedure), and it must precede any array
declarations within the module.
EXAMPLE 8.2
A Visual Basic module includes the following array declarations.
Option Base 1 DIM Customers(200) As String, Net(100) As Single, Sales(50, 100) As Single
This statement defines Customers to be a one-dimensional string array containing 200 elements, ranging from Customers(1) to Customers(200). Similarly, Net is a one-dimensional, single-precision array containing 100 elements, and Sales is a two-dimensional, single-precision array containing 5,000 elements. (Compare with Example 8.1.)
In Visual Basic, the elements of a numeric array are initialized to 0 when the array is declared. The elements of a string array are initialized as empty strings. The elements of an array may be a user-defined data type rather than a standard data type. This is handled in the same manner as ordinary variables, as explained in Chap. 2 (see Sec. 2.4). In general terms, the data type definition is written as
Type data type name member name 1 As data type 1 member name 2 As data type 2 . . . . . End Type
The array declarations can then be written as
Dim array name ( subscript 1 lower limit To subscript 1 upper limit, subscript 2 lower limit To subscript 2 upper limit, etc.) As user-defined data type
EXAMPLE 8.3
Here is a typical user-defined data type, similar to that shown in Example 2.7. Now, however, we will declare two arrays whose elements are of this type. Arrays of this type might be useful in a customer billing application.
Type Customer CustomerName As String AcctNo As Integer Balance As Single End Type
Once the data type has been defined, we can declare one or more variables of this data type, as follows.
Dim OldCustomer(100) As Customer, NewCustomer(100) As Customer
CHAP. 8]
ARRAYS
8.3 PROCESSING ARRAY ELEMENTS (SUBSCRIPTED VARIABLES) The individual elements within an array are called subscripted variables. Subscripted variables can be utilized within a program in the same manner as ordinary variables. A subscripted variable can be accessed by writing the array name, followed by the value of the subscript enclosed in parentheses. Multidimensional array elements require the specification of multiple subscripts, separated by commas. The subscripts must be integer valued and they must fall within the range specified by the corresponding array declaration. A subscript can be written as a constant, a variable or a numeric expression. Noninteger values will automatically be rounded, as required. If the value of a subscript is out of range (i.e., too large or too small), execution of the program will be suspended and an error message will appear.
EXAMPLE 8.4
All of the subscripted variable assignments shown below are written correctly.
Dim Names(10) As String, Values(10, 20) As Single, k(10) As Integer Dim a As Single, b As Single, m As Integer, n As Integer . . . . . Names(3) = "Aaron" values(8, 5) = 5.5 Names(i) = "Susan" values(m, n) = -3.2 Names(k(i)) = "Martin" values(m - 1, n + 3) = m + n Names(2 * a - b) = "Gail" values(a + b, a - b) = 3 * a Names(sqr(a ^ 2 + b ^ 2)) = "Sharon" values(abs(a + b), abs(a - b)) = a + b
Some of the subscripts may not be integer valued as written. In such cases, the noninteger values will automatically be rounded. Suppose, for example, the numeric expression (2 * a - b) has a value of 4.2. Then the subscripted variable Names(2 * a - b) will be interpreted as Names(4). Similarly, if (2 * a - b) has a value of 4.7, then the subscripted variable Names(2 * a - b) will be interpreted as Names(5).
Within a user-defined array, the individual components (members) of a subscripted variable can be accessed as array name (subscript).member name These components can be used in the same manner as ordinary variables. Thus, they can appear within expressions, and they can be assigned values (see Secs. 2.5 and 2.10).
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