How do I code 2 complement conversion of a value read from a textbox?

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I need to implement 2 complement's from the value read from a textbox. How do I code it?

What I have tried:

C#

uint Ctrl_Pitch_Position = 0;

private void txtvehPitch_TextChanged(object sender, EventArgs e)
{
     Ctrl_Pitch_Position = Convert.ToUInt16(txtvehPitch.Text);
}

Posted 26-May-20 22:22pm

pohcb_sonic

Updated 26-May-20 22:43pm

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Richard MacCutchan 27-May-20 4:40am

What exactly are you trying to do? You can complement a number quite simply by using the bitwise complement operator ~.

2 solutions

Solution 2

In general it's better to use .Parse, see: How to convert a string to a number - C# Programming Guide | Microsoft Docs[^]

Additionally you can use Math.Round(), see: Math.Round Method (System) | Microsoft Docs[^]

As a non English speaker it is not exactly clear to me what you mean by "Complement", so Griffs answer might be what you want ...

Posted 26-May-20 22:45pm

RickZeeland

Updated 26-May-20 22:49pm

v2

Comments

OriginalGriff 27-May-20 4:49am

https://en.wikipedia.org/wiki/Two%27s_complement
May help. You almost certainly know it, just under a different name.

RickZeeland 27-May-20 4:55am

Thanks, my compliments :)

OriginalGriff 27-May-20 5:07am

And 2 you ... :laugh:

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OriginalGriff · Accepted Answer · 2020-05-26T22:43:00

Firstly, don't use Convert on user input - always use TryParse instead, and report problems to the user instead of continuing. Users make mistakes: using Convert means your app crashes instead of behaving nicely and giving him a chance to fix the problem.

Two complement is easy though:

C#

UInt16 x = 666;
UInt16 Complement = (UInt16)~x;