Visual basic dot NET arrays

Visual basic .Net Arrays Programming with Microsoft Visual Basic .NET, Second Edition Programming with Microsoft Visual Basic .NET, Second Edition 2 Using a One-Dimensional Array Lesson A Objectives • Declare and initialize a one-dimensional array • Store data in a one-dimensional array • Display the contents of a one-dimensional array • Code a loop using the For Each…Next statement • Access an element in a one-dimensional array Programming with Microsoft Visual Basic .NET, Second Edition 3 Using a One-Dimensional Array Lesson A Objectives (continued) • Search a one-dimensional array • Compute the average of a one-dimensional array’s contents • Find the highest entry in a one-dimensional array • Update the contents of a one-dimensional array • Sort a one-dimensional array Programming with Microsoft Visual Basic .NET, Second Edition 4 Arrays • A simple or scalar variable is one that is unrelated to any other variable in memory • An array is a group of variables that have the same name and data type and are related in some way Programming with Microsoft Visual Basic .NET, Second Edition 5 Arrays (continued) • The most commonly used arrays are one- dimensional and two-dimensional • Programmers use arrays to store related data in the internal memory of the computer Programming with Microsoft Visual Basic .NET, Second Edition 6 One-Dimensional Arrays • A one-dimensional array is simply a row (or column) of variables • Each element in an array is identified by a subscript, which Visual Basic .NET assigns to the variable when the array is created Programming with Microsoft Visual Basic .NET, Second Edition 7 One-Dimensional Arrays (continued) • You refer to each variable in an array by its name and the variable’s subscript Figure 10-3: Names of the variables in a one-dimensional array named states Programming with Microsoft Visual Basic .NET, Second Edition 8 One-Dimensional Arrays (continued) • Declaring a one-dimensional array – Version 1 {Dim | Private} arrayname(highestSubscript) As datatype – Version 2 {Dim | Private} arrayname() As datatype = {initialValues} Programming with Microsoft Visual Basic .NET, Second Edition 9 One-Dimensional Arrays (continued) • Examples of declaring an array – Dim cities(3) As String – Private states() As String = {“Hawaii”, “Alaska”, “Maine”} Programming with Microsoft Visual Basic .NET, Second Edition 10 Storing Data in a One-Dimensional Array • In most cases, you use an assignment statement to enter data into an existing array • Syntax: arrayname(subscript) = value • Examples – cities(0) = “Madrid” – cities(1) = “Paris” – cities(2) = “Rome” [...]... Programming with Microsoft Visual Basic NET, Second Edition 24 More on One-Dimensional Arrays Lesson B Objectives • Create and manipulate parallel one-dimensional arrays • Create a structure • Declare a structure variable • Create and manipulate a one-dimensional array of structures Programming with Microsoft Visual Basic NET, Second Edition 25 Parallel One-Dimensional Arrays • Arrays that are related... and a number, you can use two one-dimensional arrays – A String array to store the product IDs – An Integer array to store the prices Programming with Microsoft Visual Basic NET, Second Edition 26 Parallel One-Dimensional Arrays (continued) Figure 10-19: Illustration of a price list stored in two onedimensional arrays Programming with Microsoft Visual Basic NET, Second Edition 27 Structures • Structure... • Search a two-dimensional array Programming with Microsoft Visual Basic NET, Second Edition 33 Two-Dimensional Arrays • A two-dimensional array resembles a table in that the variables are in rows and columns Figure 10-32: Illustration of a two-dimensional array Programming with Microsoft Visual Basic NET, Second Edition 34 Two-Dimensional Arrays (continued) • Each variable (element) in a two-dimensional... a two-dimensional array by the array’s name and the row and column subscripts Programming with Microsoft Visual Basic NET, Second Edition 35 Two-Dimensional Arrays (continued) Figure 10-34: Syntax versions and examples of declaring a twodimensional array Programming with Microsoft Visual Basic NET, Second Edition 36 ... Programming with Microsoft Visual Basic NET, Second Edition 22 Sorting the Data Stored in a OneDimensional Array (continued) • To sort a one-dimensional array in descending order: – Use Array.Sort to sort the array in ascending order – Use Array.Reverse to reverse the array elements • Syntax of the Array.Reverse method: Array.Reverse(arrayname) Programming with Microsoft Visual Basic NET, Second Edition 23... Microsoft Visual Basic NET, Second Edition 12 Displaying the Contents of a OneDimensional Array • uiDisplayButton’s Click event procedure – Demonstrates how you can display the contents of an array in a label control – Uses the For…Next statement to display each array element – You also could use the Do…Loop statement or the For Each…Next statement Programming with Microsoft Visual Basic NET, Second... a OneDimensional Array (continued) Figure 10-6: uiDisplayButton’s Click event procedure Programming with Microsoft Visual Basic NET, Second Edition 14 The For Each…Next Statement Figure 10-8: Syntax and an example of the For Each…Next statement Programming with Microsoft Visual Basic NET, Second Edition 15 Using the Subscript to Access an Element in a One-Dimensional Array • XYZ Corporation pays its... Structure statement: can be used to create your own data types in Visual Basic NET • Data types created using the Structure statement are referred to as user-defined data types or structures • Members included in the structure can be variables, constants, or procedures • In most cases, members are variables Programming with Microsoft Visual Basic NET, Second Edition 28 Structures (continued) Figure 10-21:... an example of the Structure statement Programming with Microsoft Visual Basic NET, Second Edition 29 Using a Structure to Declare a Variable • Variables declared using a structure are often referred to as structure variables Figure 10-22: Syntax and an example of declaring a structure variable Programming with Microsoft Visual Basic NET, Second Edition 30 Using a Structure to Declare a Variable (continued)... data in a member variable Programming with Microsoft Visual Basic NET, Second Edition 31 Creating an Array of Structure Variables • Assigning initial values to an array is referred to as populating the array • Refer to a member variable in an array element using the syntax: arrayname(subscript).memberVariableName Programming with Microsoft Visual Basic NET, Second Edition 32 Using a Two-Dimensional Array . Visual basic .Net Arrays Programming with Microsoft Visual Basic .NET, Second Edition Programming with Microsoft Visual Basic .NET, Second Edition 2 Using a One-Dimensional. by a subscript, which Visual Basic .NET assigns to the variable when the array is created Programming with Microsoft Visual Basic .NET, Second Edition 7 One-Dimensional Arrays (continued) • You. way Programming with Microsoft Visual Basic .NET, Second Edition 5 Arrays (continued) • The most commonly used arrays are one- dimensional and two-dimensional • Programmers use arrays to store related