How do I make calculations with one textbox

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How do I make calculations with one textbox like in the picture, I have tried to do that like this:

Example 1:
Input in textbox one = 1 + 1
Results in textbox two = 2

Example 2:
Input in textbox one = 3, 4, 5, 4
Results in textbox two = 4

Picture example:
https://image.winudf.com/v2/image/Y29tLmhpb3guTWVNZWRpTW9kZUNhbGN1bF9zY3JlZW5fMV8xNTM4MjU3MjMxXzAyOQ/screen-1.jpg?fakeurl=1&type=.jpg[^]

What I have tried:

'Example 1 code:

Dim tb1 as double
tb1 = val(textbox.text)

Rslttext = tb1

'Example 2 code:

Dim tb1 as double
tb1 = val(textbox.text)

Rslttext = math.mean(tb1)

Posted 28-Jul-20 1:01am

Icosium.ui

Updated 28-Jul-20 1:13am

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OriginalGriff · Answer 1 · 2020-07-28T01:13:00

Solution 2

That's a lot more complicated than you might think.
But, it's been done a load of times, so try here: math / function / boolean /string expression evaluator[^]
Or even:

C#

DataTable dt = new DataTable();
object result = dt.Compute("12 * (8 - 3) / 2","");

Posted 28-Jul-20 1:13am

OriginalGriff

Richard MacCutchan · Answer 2 · 2020-07-28T01:12:00

The Val function converts a string from text characters to an actual numeric value. But it does not calculate expressions, you need to write the code to do that part. See Conversion.Val Method (Microsoft.VisualBasic) | Microsoft Docs[^].

[edit]
See also An expression evaluator written in VB.NET[^]
[/edit]