Understanding and Manipulating One-Dimensional and Two-Dimensional Arrays in Programming
This guide covers the creation and manipulation of parallel one-dimensional arrays and the basics of two-dimensional arrays. Learn to initialize two-dimensional arrays, store data effectively, and utilize efficient searching techniques. Gain insight into array fundamentals, including element identification via subscripts, zero-relative indexing, and essential operations like sorting and reversing array elements. This resource is perfect for programming enthusiasts seeking to enhance their skills in data structure management.
Understanding and Manipulating One-Dimensional and Two-Dimensional Arrays in Programming
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Presentation Transcript
Objectives • Create and manipulate parallel one-dimensional arrays • Create and initialize a two-dimensional array • Store data in a two-dimensional array • Search a two-dimensional array
Parallel One-Dimensional Arrays • Parallel arrays: • Two or more arrays whose elements are related by their position in the arrays
Parallel One-Dimensional Arrays (continued) • Hands-on Example
Two-Dimensional Arrays • Two-dimensional array: • Resembles a table with rows and columns • Each element is identified by a unique combination of two subscripts: (row, column) • Subscripts are zero-relative
Two-dimensional array: • Syntax: Form 1 [Dim|Private] arrayname(highestrowsubscript, highestcolumnsububscript) as dataytype Form 2 [Dim|Private] arrayname(, ) as dataytype= {{ initial values}…….{initialvalues}}
Two-Dimensional Arrays (continued) • Hands-on Example
Two-Dimensional Arrays (continued) • Two-dimensional array: • Declared with highest row subscript and highest column subscript (zero-relative) • Number of rows = highest row subscript + 1 • Number of columns = highest column subscript + 1 • Can specify initial values for array elements • If no initial values are declared, array elements are automatically initialized
Storing Data in a Two-Dimensional Array • Hands-on Example
Searching a Two-Dimensional Array • Hands-on Example
Summary • Arrays: a group of related variables with the same name and same data type • Array element: one item in the array • One-dimensional array: each element is uniquely identified by its position (subscript) in the array • Two-dimensional array: each element is uniquely identified by its position (row and column subscripts) in the array • Subscripts are zero-relative
Summary (continued) • Number of elements in an array is the highest subscript value + 1 • For Each...Next statement: used to loop through all the elements in an array • Length property: returns the number of elements in an array • Array.Sort method: sorts the elements in a one-dimensional array in ascending order • Array.Reverse method: reverses the order of elements in a one-dimensional array
