How do you create an array in visual basic?

Answer 1

If you are referring to the searching and sorting of strings, there are 2 main methods that Visual Basic uses most. If you want to search for a phrase in a string, you would probably use the InStr method, which would give you an integer which would indicate the place where the phrase was found. It might look something like this:

Dim InputString as String

Dim StringToFind as String = "Whatever text you want to find"

Dim PositionInteger as Integer

PositionInteger = InStr(InputString, StringToFind)

If you wanted to sort the string, you could do it with the substring method using the split point you found with the previous code. To do that, you would make a variable that would contain the latter half of your string, and use the subtring method to extract it from the whold string. To do that, you must type "Substring" and in parenthasis, give it a starting position, and an ending position. If you want all the characters from the phrase to the end of the sting, you do not need to put in an end point. The starting point for this example will be the position of the start of the search phrase, plus thirty (since you want to start after the end of the phrase, which is thirty characters long). Your code might look like this:

Dim NewString as String

NewString = Substring(PositionInteger + 30)

This would make the variable "NewString" contain all the characters following the search phrase.

Answer 2

The following code declares a list (or array) of TEN numbers...

Dim List(10) As Short

Now, lets say you wanted to enter 25 as the fifth number in the list...

List(5) = 25

What about a list of strings (text)? Replace Short with String!

Answer 3

Dim Name(1 to 50) as String

"Name" is the identifier name, "1 to 50" are the boundaries for the array - you have to start with 1. And then you declare the data type, in this case a String.

Answer 4

An array is a collection of values stored in a single variable.

For example, if you had the following temperatures for a month, each in its own variable:

Day1 = 50

Day2 = 52

Day3 = 55

Day4 = 70

... etc. etc.

You could instead store all of those in an array. An array is a variable with parenthesis after it to indicate the ELEMENT of the array.

So, you could do the same thing with an array:

Temperatures(1) = 50

Temperatures(2) = 52

Temperatures(3) = 55

Temperatures(4) = 70

... etc.

This way, if I wanted to know the temperature for day 3, I would reference it as:

Temperatures(3)

Arrays must first be dimensioned. In other words, the memory space for the array must be allocated. In VB, this can be either static or dynamic. Static is used when you know how many elements there will be; so if I wanted an array for 30 days of temperature storage, I would use:

DIM Temperatures(30)

However, if I didn't know how many elements I was going to have, I could use a dynamic array:

DIM Temperatures()

... however, I need to ReDim my array every time I add things to it.

LBOUND and UBOUND will tell you how many elements an array has been dimensioned for... .so you can use the REDIM in conjunction with the UBOUND to add another array element.

For example, I have an array with 4 dimensions. I need to make it bigger...

DIM iArray()

REDIM iArray(4)

iArray(1) = 1

iArray(2) = 2

iArray(3) = 3

iArray(4) = 4

' Add another array dimension

REDIM PRESERVE iArray(UBOUND(iArray()+1)

.... the PRESERVE is very important; if you just REDIM your array without preserve, then the array is cleared.

Answer 5

Use Array.Sort on your stored array, as follows:

Dim intArray As Integer = {1, 4, 2, 6, 10}

Array.Sort(intArray)

This will sort your array in ascending order.

Answer 6

An array is an aggregate of elements of the same type.