Re: Double value from negative to positive - C# Discussion Boards

Re: Double value from negative to positive

Josh Smith15-Aug-06 8:42

Josh Smith

15-Aug-06 8:42

Just for the sake of completeness...

double positiveValue = (double)Math.Abs( negativeValue );

:josh:
My WPF Blog[^]

Re: Double value from negative to positive

Guffa15-Aug-06 8:46

Guffa

15-Aug-06 8:46

Use the negation operator (-):

double x = -3.14;<br />
x = -x;

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Re: Double value from negative to positive

Saamir15-Aug-06 8:50

Saamir

15-Aug-06 8:50

Thank you guys, I went ahead using ftemp=0-ftemp;

Appreciate the response

sasa

Re: Double value from negative to positive

Guffa15-Aug-06 9:19

Guffa

15-Aug-06 9:19

Actually, that should be:

ftemp = 0.0 - ftemp;

The value 0 is an integer value. You should use a double value to make sure that your value doesn't get converted to an integer before the calculation.

The zero value is superflous, though:

ftemp = -ftemp;

Smile | :)

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Re: Double value from negative to positive

Josh Smith16-Aug-06 4:35

Josh Smith

16-Aug-06 4:35

Guffa wrote:
The value 0 is an integer value. You should use a double value to make sure that your value doesn't get converted to an integer before the calculation.

Just to be pedantic, the integer value (0) would be widened to a double value (0.0), not the other way around.

:josh:
My WPF Blog[^]

Re: Double value from negative to positive

Judah Gabriel Himango15-Aug-06 9:05

Judah Gabriel Himango

15-Aug-06 9:05

SASA_1 wrote:
How do I change a double value from negative to positive. i.e. -3.14 to 3.14

<sarcasm>

Convert it to a string, remove the first character, then parse the value from the string.

</sarcasm> (yes, people have done this[^])

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Re: Double value from negative to positive

Dave Kreskowiak15-Aug-06 9:10

Dave Kreskowiak

15-Aug-06 9:10

You've got to be kidding me!! I find it interesting to see the miriad of solutions people come up with for such a simple problem. But DAMN, the performance and memory implications of this one, in a high-use situation, are just sickening!! Good job!! Laugh | :laugh:

Dave Kreskowiak
Microsoft MVP - Visual Basic

Re: Double value from negative to positive

Judah Gabriel Himango15-Aug-06 9:15

Judah Gabriel Himango

15-Aug-06 9:15

Dave Kreskowiak wrote:
But DAMN, the performance and memory implications of this one, in a high-use situation, are just sickening!

yep. Apparently there are people with so little knowledge of math, they didn't realize a simple -1 multiplication would swap the sign.

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Re: Double value from negative to positive

Dave Kreskowiak15-Aug-06 9:58

Dave Kreskowiak

15-Aug-06 9:58

I weep for the software of tomorrow! Cry | :((

Dave Kreskowiak
Microsoft MVP - Visual Basic

Re: Double value from negative to positive

Josh Smith16-Aug-06 4:33

Josh Smith

16-Aug-06 4:33

Dave Kreskowiak wrote:
I weep for the software of tomorrow!

I weep for the software of today (aka VS2005) Cry | :((

:josh:
My WPF Blog[^]

Re: Double value from negative to positive

Dave Kreskowiak16-Aug-06 12:06

Dave Kreskowiak

16-Aug-06 12:06

Yeah, I'm feeling that pain too! I'm dying to get my hands on the SP, but causiously. It seems every other SP that comes out breaks more than it fixes...

Dave Kreskowiak
Microsoft MVP - Visual Basic

Re: Double value from negative to positive

Guffa15-Aug-06 10:14

Guffa

15-Aug-06 10:14

Judah Himango wrote:
yep. Apparently there are people with so little knowledge of math, they didn't realize a simple -1 multiplication would swap the sign.

Or so little knowledge of the language that they don't realize that there is a negation operator that is specially made for just changing the sign of a number. Wink | ;)

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Re: Double value from negative to positive

Paul Conrad15-Aug-06 11:58

Paul Conrad

15-Aug-06 11:58

Judah Himango wrote:
Convert it to a string, remove the first character, then parse the value from the string.

That's no moon, it's a space station. - Obi-wan Kenobi

student table drag drop

TAREQ F ABUZUHRI15-Aug-06 6:16

TAREQ F ABUZUHRI

15-Aug-06 6:16

i try to make program for (sheduler student table ) in univercity

student can have lecture any time from 8 am to 2 pm in all days acept sunday ...

|8-9|9-10|10-11|11-12|12-1|1-2|
----+------------------------------
mon | | | | | | |
----+------------------------------
tue | | | | | | |
----+------------------------------
wed | | | | | | |
----+------------------------------
thu | | | | | | |
----+------------------------------
fri | | | | | | |
----+------------------------------

my qastions

1- how can make this table in WinApp form
2- how can make drag and drop to Cell in ( Mon 11-12) to ( thu 10-11)
just the how make drag and drop

Palestine

Re: student table drag drop

Judah Gabriel Himango15-Aug-06 7:19

Judah Gabriel Himango

15-Aug-06 7:19

You can use the DataGridView[^] component to display data from a database. You can simply place the DataGridView on a Windows Form in the Visual Studio designer.

Perhaps this article[^] will help you out with dragging cells in teh DataGridView.

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Depends on where you are

Ennis Ray Lynch, Jr.15-Aug-06 11:25

Ennis Ray Lynch, Jr.

15-Aug-06 11:25

I think in the States students are used to seeing

M T W R F S
8-9
9-10
10-11
11-12
...

A man said to the universe:
"Sir I exist!"
"However," replied the Universe, "The fact has not created in me A sense of obligation."

-- Stephen Crane

TreeView Quastion

ytubis15-Aug-06 6:06

ytubis

15-Aug-06 6:06

Hi!
I have a problem, if i have a treeview which is filled with allot of TreeNodes and for some reason i need to restart the treeview, can i restart it to the same visible mode that it was before, i mean if i opened node one and its chield and its chield, and now i restart it, i mean create it again can i visibly show the same childs as it was before the restart, this is of corse when the treeview does not change.
Thanks Smile | :)

Re: TreeView Quastion

Judah Gabriel Himango15-Aug-06 7:21

Judah Gabriel Himango

15-Aug-06 7:21

You can, but there's no magic way to do this. When you clsoe the TreeView, record the node hierarchy and each node's expanded state. When you want to restore your nodes, you'll have to do this manually based on the information you previously recorded.

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Re: TreeView Quastion

Josh Smith15-Aug-06 8:39

Josh Smith

15-Aug-06 8:39

The TreeViewWalker[^] utility class might make this task easier for you.

:josh:
My WPF Blog[^]

catch sound From Modem [modified]

mehrdadc4815-Aug-06 5:11

mehrdadc48

15-Aug-06 5:11

Hi.
I want to catch the audio from modem when somebody calls my computer by phone.
i.e that must convert the analog sound that arrives to modem, to digital in the form that I can get it.
Now I can establish a call via modem commands.
I prefer that do this in managed code in c#

-- modified at 11:31 Tuesday 15th August, 2006

Best wishes

livst view

TAREQ F ABUZUHRI15-Aug-06 5:10

TAREQ F ABUZUHRI

15-Aug-06 5:10

i use list view that have control in this page
http://www.codeproject.com/cs/miscctrl/ListViewEmbeddedControls.asp

* if i have database with 3 recode ex:
------
field 1
------
5
7
8
-----

i want to add 3 row in the listView with first colum must be button(ClickMe)

the problem new
-----------------
1 - how i make my app when i click in the fisrt (ClickMe) button -> open new Form with 5 as parameter - > new Form(5);

and second button new Form(7);

Palestine

Re: livst view

Judah Gabriel Himango15-Aug-06 5:15

Judah Gabriel Himango

15-Aug-06 5:15

First, you need to get the data out of your database. To do that, use ADO.NET. If you have an ADO.NET-specific question, ask in the ADO.NET forum[^].

Once you've got your data out of the database, you can provide a constructor that takes an integer for each form you want to pass:

class MyForm : Form
{
    public MyForm(int integer)
    {
       ...
    }
}

You can then construct it like

MyForm form = new MyForm(5);

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Re: livst view

TAREQ F ABUZUHRI15-Aug-06 5:40

TAREQ F ABUZUHRI

15-Aug-06 5:40

hello Judah Himango

i know how to connect to database
and i know how to open form with parameter

the probelm now if i want to generate button on form load what i must do to get parameter 5 on Click on the second button ...

Palestine

Re: livst view

Judah Gabriel Himango15-Aug-06 5:47

Judah Gabriel Himango

15-Aug-06 5:47

Let me make sure I'm understanding. You want to get parameter 5 once the button is clicked?

To generate a button from code and listen for a click event:

// inside your form code
Button b = new Button();
this.Controls.Add(b);
b.Click += new EventHandler(OurClickHandler);

...

void OurClickHandler(object sender, EventArgs e)
{
    // The button was clicked.
}

Does that answer your question?

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Judah Himango

Re: livst view

TAREQ F ABUZUHRI15-Aug-06 6:25

TAREQ F ABUZUHRI

15-Aug-06 6:25

thankssssssssssssss

Palestine

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