increase array index by 1?

hi I’m having trouble inputting data in to an array. The first input is fine but after that it just overwrites the first input. i tried to write it so that it would increase the array index by one each time but it hasn’t worked. Any suggestions?

Code:

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Public Class Form1
    Private InputStudentName As String
    Private StudentNames(9) As String

    Private Questions(29, 2) As String

    Private Sub StudentLogOn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles StudentLogOn.Click
        StudentNames(0) = ""
        StudentNames(1) = ""
        StudentNames(2) = ""
        StudentNames(3) = ""
        StudentNames(4) = ""
        StudentNames(5) = ""
        StudentNames(6) = ""
        StudentNames(7) = ""
        StudentNames(8) = ""
        StudentNames(9) = ""
        Dim n As Integer

        For n = n To n


            StudentNames(n) = InputBox("enter your full name")
            n = n + 1
        Next

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Code:

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Redim Preserve StudentNames(StudentNames.Length)

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Code:

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For n = n To n

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Huh???

Say n = 1, your for loop is from 1 to 1. It should only ever execute once. Then inside your loop you manually increment your loop counter.

You should also never use a variable for your loop counter that is also one of the bounds of the loop, and you shouldn't manually adjust the loop counter.

you can't do a loop as

Code:

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for n = n to n

next

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it will only run once. Not to mention a for loop increments n automatically, you don't need to add 1 to it inside the loop. You should be doing

Code:

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for n = 0 to (StudentNames.Length - 1)
 'code here
next

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to loop all elements of the array.

ah ok i will give that a go. thanks

Quote:

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Originally Posted by kleinma

you can't do a loop as

Code:

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for n = n to n

next

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it will only run once. Not to mention a for loop increments n automatically, you don't need to add 1 to it inside the loop. You should be doing

Code:

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for n = 0 to (StudentNames.Length - 1)
 'code here
next

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to loop all elements of the array.

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ok, i see. that loops the input box till the end of the array. that not really what i need the program to do. i need it so that a student can log in to the program, with their name stored in to the array, then they can run the rest of the progam before another student enters their name

since this is obviously homework, can you post the actual homework question?

When you are inputing your data into the variable, that is where you want to increment the array index.

It looks like you're filling each array index with "" and then cycling through each one, then inputting the value's in via input box.

Declare a variable for your index array.

vb Code:

Dim intArrayIndex as Integer = 0

When you are inputing your data, you're going to input into the following.

vb Code:

StudentNames(intArrayIndex) = InputBox("enter your full name")

To increment the array index (ie the integer value)

vb Code:

intArrayIndex += 1