#Visual basic data structure code
#Visual basic data structure plus

The code for the cmdSortData button is almost identical to the code for the cmdRawData button, except for the command Array.Sort(examScores). StrOutput &= examScores (count) & vbNewLine In the form design window, double-click on the cmdSortData button and add the following code at the cursor:.Thanks to the facilities available for handling arrays in VB.Net however, the task is now much easier. At one time this would have involved writing something like a bubble sort. The most difficult thing we will attempt is to sort the scores and display them in order of magnitude. The other functions we want to implement include displaying the average, highest and lowest scores, which involves slightly more effort. Simply displaying the array values is relatively simple, as you can see.

The message box then displays the string.

#Visual basic data structure plus

Next loop accesses each array element in turn, and appends each value, plus a newline character, to the string variable strOutput. The initial Dim statement assigns twenty exam scores (each representing marks out of 100) to the integer array examScores(). The message box output for the Display raw data button

Open a new project called 'ExamScores' and create an interface like the one illustrated below.

To demonstrate the principle, we will create a simple program that stores a set of exam scores in an array, and then manipulates the array data in various ways. You can also declare an array without specifying the number of elements it will hold:Ī simple one-dimensional array is essentially a numbered list of variables of the same data type. The following statement declares and populates the array at the same time (note that this time there is no number within the parentheses) :ĭim strWeekDays() As String = The following code declares an array of type String with seven elements, and then populates it: That said, you can declare an array and populate it with data at the same time. This feature makes it very easy to use a loop construct to navigate through the elements of an array, or to sort the elements into alphabetical or numerical order.Īn array variable must be declared just like other variables, but it is not necessary to specify the number of elements. In order to find a particular array element, it is only necessary to know the address in memory of the first item in the array and the array subscript of the element being sought. These index numbers (called array subscripts) start from zero, so the first item in an array has the index number 0, the second item has the index number 1, and so on.Īll of the data items in an array (called the array elements) are stored in contiguous locations in memory, and occupy the same amount of space. All of the variables in the array have the same name, but each is given a unique index number in accordance with its position within the array. An array is a collection of related variables of the same type.