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Clearly Visual Basic: Programming with Visual Basic 2008. Chapter 21 Table Tennis Anyone?. Objectives. Create a two-dimensional array Store data in a two-dimensional array Search a two-dimensional array Sum the values in a two-dimensional array. Let’s Table That Idea for Now.

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objectives
Objectives
  • Create a two-dimensional array
  • Store data in a two-dimensional array
  • Search a two-dimensional array
  • Sum the values in a two-dimensional array

Clearly Visual Basic: Programming with Visual Basic 2008

let s table that idea for now
Let’s Table That Idea for Now
  • Two-dimensional array
    • Resembles a table in that the variables (elements) are in rows and columns
    • Each variable is identified by a unique combination of two subscripts
    • Variables located in the first row are assigned a row subscript of 0
    • Variables in the second row are assigned a row subscript of 1

Clearly Visual Basic: Programming with Visual Basic 2008

let s table that idea for now continued
Let’s Table That Idea for Now (continued)
  • Figure 21-2
    • Dim keyword
      • Used to create a procedure-level array
    • Private keyword
      • Used to create a module-level array
  • If array has two rows:
    • Statement that declares and initializes the array should have two initialValues sections
  • Use an outer loop and a nested loop:
    • To access each element in a two-dimensional array

Clearly Visual Basic: Programming with Visual Basic 2008

revisiting the employee application
Revisiting the Employee Application
  • Figure 21-4
    • Shows planning information for the Employee application using a two-dimensional array
  • The values stored in an array
    • Come from a file on the computer’s disk
    • Are assigned to the array after it is declared

Clearly Visual Basic: Programming with Visual Basic 2008

the getlowerbound and getupperbound methods
The GetLowerBound and GetUpperBound Methods
  • Return an integer that indicates:
    • The lowest subscript and highest subscript, respectively, in the specified dimension in the array
  • Figure 21-6
    • arrayName
      • Name of the array
    • dimension
      • Integer that specifies the dimension whose upper or lower bound you want to retrieve

Clearly Visual Basic: Programming with Visual Basic 2008

calendar orders application
Calendar Orders Application
  • Displays the total number of calendars ordered by three stores in each of six months
  • Number ordered each month by each store
    • Stored in a three-row, six-column array

Clearly Visual Basic: Programming with Visual Basic 2008

summary
Summary
  • Each element in a two-dimensional array
    • Identified by a unique combination of two subscripts: a row subscript and a column subscript
  • The first row subscript in a two-dimensional array is 0
  • When declaring a two-dimensional array:
    • Provide either the highest row and column subscripts or the initial values
  • Number of rows in a two-dimensional array
    • One number more than its highest subscript

Clearly Visual Basic: Programming with Visual Basic 2008

summary continued
Summary (continued)
  • Refer to an element in a two-dimensional array
    • Using the array’s name followed by the element’s row and column subscripts
  • Use both an outer loop and a nested loop to:
    • Access each element in a two-dimensional array
  • Array’s GetLowerBound and GetUpperBound methods
    • Return the lowest subscript and highest subscript, respectively

Clearly Visual Basic: Programming with Visual Basic 2008

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