I have two floats in Python that I'd like to subtract, i.e.
v1 = float(value1)
v2 = float(value2)
diff = v1 - v2
I want "diff" to be computed upto two significant figures, that is compute it using %.2f of v1 and %.2f of v2. How can I do this? I know how to print v1 and v2 up to two decimals, but not how to do arithmetic like that.
thanks.
I am writing a application where I am dealing with 4 activities, let's say A, B, C & D. Activity A invokes B, B invokes C, C invokes D. On each of the activity, I have a button called "home" button. When user clicks on home button in any of the B, C, D activities, application should go back to A activity screen ?
How to simulate "home" button in this case ?
colLabels[i].addMouseListener(new MyAdapter());
private class MyAdapter extends MouseAdapter {
@Override
public void mouseClicked(MouseEvent event) {
ColJLabel colJLabel = (ColJLabel)event.getComponent();
System.out.println(colJLabel.ColID);
setColumnHeader(false);
}
}
colLabels[i].setEnabled(flag);
The situation is this: Mouse clicks are trapped correctly but when i have the JLabel (ColJLabel) control disabled it still reports mouse clicks.
How can I make so that mouse clicks are only reported when the control is enabled?
Thanks.
I have a float value between 0 and 1. I need to convert it with -120 to 80.
To do this, first I multiply with 200 after 120 subtract.
When subtract is made I had rounding error.
Let's look my example.
float val = 0.6050f;
val *= 200.f;
Now val is 121.0 as I expected.
val -= 120.0f;
Now val is 0.99999992
I thought maybe I can avoid this problem with multiplication and division.
float val = 0.6050f;
val *= 200.f;
val *= 100.f;
val -= 12000.0f;
val /= 100.f;
But it didn't help. I have still 0.99 on my hand.
Is there a solution for it?
Edit: After with detailed logging, I understand there is no problem with this part of code. Before my log shows me "0.605", after I had detailed log and I saw "0.60499995946884155273437500000000000000000000000000"
the problem is in different place.
Hi,
I have trouble seing the utility of the function pointers. I guess it may be useful in some cases (they exist, after all), but I can't think of a case where it's better or unavoidable to use a function pointer.
Could you give some example of good use of function pointers (in C or C++)?
Many thanks :)
Hi, guys.
Here is the example with comments:
class Program
{
// first version of structure
public struct D1
{
public double d;
public int f;
}
// during some changes in code then we got D2 from D1
// Field f type became double while it was int before
public struct D2
{
public double d;
public double f;
}
static void Main(string[] args)
{
// Scenario with the first version
D1 a = new D1();
D1 b = new D1();
a.f = b.f = 1;
a.d = 0.0;
b.d = -0.0;
bool r1 = a.Equals(b); // gives true, all is ok
// The same scenario with the new one
D2 c = new D2();
D2 d = new D2();
c.f = d.f = 1;
c.d = 0.0;
d.d = -0.0;
bool r2 = c.Equals(d); // false, oops! this is not the result i've expected for
}
}
So, what do you think about this?
i have 2 domain, 1 is old domain, 1 is new domain
i setup my new site in new domain, but i wish to have www.domain.com/testing/ redirect to the old domain's folder.
can it be done? how?
I'm curious about infinite numbers in computing, in particular pi.
For a computer to render a circle it would have to understand pi. But how can it if it is infinite?
Am I looking too much into this? Would it just use a rounded value?
I asked a question like this in an interview for a entry level programmer:
var instance1 = new myObject{Value = "hello"}
var instance2 = instance1;
instance1.Value = "bye";
Console.WriteLine(instance1.Value);
Console.WriteLine(instance2.Value);
The applicant responded with "hello", "bye" as the output.
Some of my co-workers said that "pointers" are not that important anymore or that this question is not a real judge of ability.
Are they right?
I am a new user of Java swing. I need to be able to create a popup with row info when the user clicks on that row. I managed to incorporate the mouseClick event reaction in my table class, and I have the row info available. But I don't know how to notify the main window about the event so it can display the dialog box/popup box. Can you help me?
So I'm not really sure how to go about doing this at all.
I've got an anchor on the left with id="left" and one on the right with id="right". On the hover event, the image thumbnails should start sliding left or right. If there's not enough thumbnails, there should be no sliding.
It can only fit 4 images in between the left and right anchors. How can I hide all anchors that are not in between the left and right anchors? I want the images to actually slowly move left or right, not just be sudden.
Any ideas? I know how to bind the events and such just fine. I just don't really now how to get started with the image placement.
Is this technology still popular?
I want to make a website which automatically transforms XSLT files. It should work like this:
When a user accesses the site, a single handler would accept his request and then find a suitable XML for it (according to the URL requested) and transform it using its attached XSL file.
I want to do this in order to make it easy to update the site using plain XML files (instead of using a full-fledged & expensive CMS system).
What do you say? good idea? bad idea? anyone has a recommendation?
Thanks!
i want validate the login screen which will come from jnlp link or from desktop shortcut
if it is from jnlp link directly i have to open my application
otherwise
i have to show login screen for user credentials.
please do needful .
regards,
Naraimha
Hi awesome!
We know that MarshalByRef allow us to create an object in a different AppDomain and use a Proxy object to access it. And the behavior of that object is in a different context of the AppDomain where it actually lives in. Well this sounds faily reseaonable in the regard of isolation and safety.
But why is there still MarshalByValue? MarshalByValue just leads to an newly deserialized object which is an exact copy of the object in a different AppDomain. If we need that object, why not just create it in the current AppDomain? Why bother to first create it in a different AppDomain and then get it back by MarshaoByValue?
Many thanks.
I am using jQuery star rating control found at http://www.fyneworks.com/jquery/star-rating/#tab-Overview . I am using 5 stars, each star having a particular value from 1 to 5. The control is getting displayed and behaving properly. However, I have a requirement of getting the value of the star clicked, immediately after a star is clicked. I do not know how to do it.
I appreciate your help.
I'm trying to figure out if I have points that make for example a square:
* *
* *
and let's say I know the center of this square.
I want a formula that will make it for eample twice its size but from the center
* *
* *
* *
* *
Therefore the new shape is twice as large and from the center of the polygon. It has to work for any shape not just squares.
I'm looking more for the theory behind it more than the implementation.
Thanks
I am facing an issue while dividing a double with an int. Code snippet is :
double db = 10;
int fac = 100;
double res = db / fac;
The value of res is 0.10000000000000001 instead of 0.10.
Does anyone know what is the reason for this? I am using cc to compile the code.
Hi, I'm pretty new to C# and asp.net so aplogies if this is a really stupid question.
I'm using a grid view to display a number of records from a database.
Each row has an Edit Button. When the button is clicked I want an ID to be passed back to a funtion in my .cs file. How do I bind the rowID to the Button field?
I've tired using a hyper link instead but this doens't seem to work because I'm posting back to the same page which already has a Permanter on the URL.
asp.net
<asp:GridView ID="gvAddresses" runat="server" onrowcommand="Edit_Row">
<Columns>
<asp:ButtonField runat="server" ButtonType="Button" Text="Edit">
</Columns>
</asp:GridView>
c#
int ImplantID = Convert.ToInt32(Request.QueryString["ImplantID"]);
Session.Add("ImplantID", ImplantID);
List<GetImplantDetails> DataObject = ImplantDetails(ImplantID);
System.Data.DataSet DSImplant = new DataSet();
System.Data.DataTable DTImplant = new DataTable("Implant");
DSImplant.Tables.Add(DTImplant);
DataColumn ColPostCode = new DataColumn();
ColPostCode.ColumnName = "PostCode";
ColPostCode.DataType = typeof(string);
DTImplant.Columns.Add(ColPostCode);
DataColumn ColConsigneeName = new DataColumn();
ColConsigneeName.ColumnName = "Consignee Name";
ColConsigneeName.DataType = typeof(string);
DTImplant.Columns.Add(ColConsigneeName);
DataColumn ColIsPrimaryAddress = new DataColumn();
ColIsPrimaryAddress.ColumnName = "Primary";
ColIsPrimaryAddress.DataType = typeof(int);
DTImplant.Columns.Add(ColIsPrimaryAddress);
DataColumn ColImplantCustomerDetailsID = new DataColumn();
ColImplantCustomerDetailsID.ColumnName = "Implant ID";
ColImplantCustomerDetailsID.DataType = typeof(int);
DTImplant.Columns.Add(ColImplantCustomerDetailsID);
foreach (GetImplantDetails Object in DataObject)
{
DataRow DRImplant = DTImplant.NewRow();
DRImplant["PostCode"] = Object.GetPostCode();
DRImplant["Consignee Name"] = Object.GetConsigneeName();
DRImplant["Primary"] = Object.GetIsPrimaryAddress();
DRImplant["Implant ID"] = Object.GeTImplantCustomerDetailsID();
DTImplant.Rows.Add(DRImplant); <--- this is what I need to be added to the button
}
gvAddresses.DataSource = DTImplant;
gvAddresses.DataBind();
Hey guys,
I have a chat box with a user list.
I want to create a button for each member so if clicked, their username is added to the chatroom text box.
Whats the best way to do this?
Thanks
Hi,
I have written a small program where the program works differently on different operating systems (xp, win7) The problem is the program reads some float numbers such 2,686.
One operating system (win7) convert it to float true, but on xp it goes wrong and print it 2686. How can I understand which symbol the operation system uses for decimal numbers ?
Thanks.
Hi, right now I'm just trying to figure out how I could do the following :
I have this text right, and it says "report"
I'd like it, so when someone clicks on the report link, it simply executes some PHP code and then changes the text from "report" to "reported" and the font from red to green.
Thanks!
Hi all. I made a simple FlowChat Editor that creates rectangles and triangles and connect them each other and shows the way from up to down. I can move this elements on screen to .But I am tying to create button to delete element which I clicked. There is problem that I can delete mytriangle object but but I cant delete myRectangle objects.It deletes but not object which i clicked.I delete from first object to last ..Here my code ...
if (deleteObj) {
if (rectsList.size() != 0) {
for (int i = 0; i < rectsList.size(); i++) {
MyRect rect = (MyRect) rectsList.get(i);
if (e.getX() <= rect.c.x + 50 && e.getX() >= rect.c.x - 50
&& e.getY() <= rect.c.y + 15 && e.getY() >= rect.c.y - 15) {
rectsList.remove(rect);
System.out.println("This is REctangle DELETED\n");
}
}
}
if (triangleList.size() != 0) {
for (int j = 0; j < triangleList.size(); j++) {
MyTriangle trian = (MyTriangle) triangleList.get(j);
if (e.getX() <= trian.c.x + 20 && e.getX() >= trian.c.x - 20
&& e.getY() <= trian.c.y + 20 && e.getY() >= trian.c.y - 20) {
triangleList.remove(trian);
System.out.println("This is Triangle Deleted\n");
}
}
}
The C++ standard mandates that all conforming implementations support the following two signatures for main:
int main();
int main(int, char*[]);
In case of the latter signature, would the addition of (top-level) const-ness break any language rules?
For example:
int main(const int argc, char** const argv);
From my understanding, top-level const qualification doesn't affect the function's signature hash, so it should be legal as far as the specification is concerned.
Also, did anyone ever encounter an implementation which rejected this type of modification?