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Hi all,
I have to compare two double values, say x and y. I compared using this simple method x < y, but the result seems to be varying in different cases. Sometimes eventhough x and y are equal, the output may be x is less than y and viceversa,
So Please help me to have a good method for comparison of double values.
Thanks in Advance
Velayudhan
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can you show the values you are comparing,
code you you are using.
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When comparing floating point/double values, you should pick some small value and compare the difference of your two values to that value. For example:
double x = 3.14159265;
double y = 3.141592654;
const double epsilon = 0.00001;
bool IsEqualTo(double x, double y, double epsilon)
{
return (abs(x - y) < epsilon);
}
bool test = IsEqualTo(x, y, epsilon);
Small differences in precision can creep up when doing math with floats and doubles. Comparing their difference with some small value allows you to control which precision is important to you.
If you decide to become a software engineer, you are signing up to have a 1/2" piece of silicon tell you exactly how stupid you really are for 8 hours a day, 5 days a week
Zac
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hi ,
does anybody know why this thing happen ?
i needed to keep thread count of an application to 2 and i found that when i'm calling CoCreateInstance it creates a thread internally..
do u know whats the reason ?
------------------------------
Its not the fall that kills you; it's the
sudden stop at the end.
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Hi All,
I wrote a Shell Extension for context menu..
I inserted my menu item and assigned a bitmap to it..
But if mouse hovers my item the color of the bitmap is inverted, how can i avoid this??
Do your Duty and Don't expect the Result
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Any links or articles regarding this will also helpful
Do your Duty and Don't expect the Result
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Hi Whitesky,
Thanks, but those articles talk about owner draw menu..
But in my case i can't draw the menu..
I'm implementing IContextMenu...
So, i have control over menu only in IContextMenu::QueryContextMenu...
Do your Duty and Don't expect the Result
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Hi,
Please tell me how to plot a single dot in directx with mode 320x200. i have to plot hundreds of dots to form a figure. all the examples about directx programming tackles almost "loading" a bitmap then animating it.
e.g. drawing letter "A" using only the pixels meaning drawing each pixels(with respective x and y coordinates) until you will form the letter "A".
"We are all the same in different ways" Kuroro Rucilful
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You can achieve that without using DirectX. You can just use GDI or GDI+. However, if you want to use DirectX (Direct3D), you can do that. Just create a direct3d surface, and when you want to access the individual pixel, call GetBackBuffer(), which returns a pointer to the buffer array (in a structure). You can access each pixel, and change it as you like.
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Hi everyone,
This is a sample program in pascal with the aid of a little assembly. Assume that Mode 13h is being made before this line of code by INT 10H.
Does DirectDraw has this some sort of function?
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
Writes a pixel dot of a specified color at a specified screen
coordinate.
On entry: AH 0Ch
AL Pixel color
CX Horizontal position of pixel
DX Vertical position of pixel
BH Display page number (graphics modes with more
than 1 page)
Returns: None
Registers destroyed: AX, SP, BP, SI, DI
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
As seen from our SetMCGA example, you would write this by doing the following:
BEGIN
asm
mov ah,0Ch
mov al,[col]
mov cx,[x]
mov dx,[y]
mov bx,[1]
int 10h
end;END;
"We are all the same in different ways" Kuroro Rucilful
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Sounds kind of trivial. Perhaps your teacher can't speak English, but given how easy that info is to find using google ( or even by reading articles on this site ), I doubt that's really the core problem.
You've understood the question, because I can understand what you've typed. Now refer to your reference books, or google.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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eh... the only reason i understood the assignment was because he gave it to us on paper. I'm just not understanding how to write the code. it's the planning i have the problem with.
AFTER i see the code done correctly i understand it. I can debug till the end of time and do that right. it's actually sitting down to write it that i have a problem with
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GameDesignerXIX wrote: it's actually sitting down to write it that i have a problem with
Plainly. That, and using google.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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I can not do your homework but I can post a few links that should help:
[STL List]
[STL Vector]
JohnLast modified: Thu Aug 3 21:47:49 2006 --
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Message deletion with out any reason is crime here
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You
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His message said 'I hate my class, my teacher can't speak English, but I've been told to write an app that uses 'iterators' to put stuff into a vector and take it out. It's too hard, please write it for me.' My responses are probably why he deleted it.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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Christian Graus wrote: His message said 'I hate my class, my teacher can't speak English, but I've been told to write an app that uses 'iterators' to put stuff into a vector and take it out. It's too hard, please write it for me.' My responses are probably why he deleted it.
ohh I believe might be your comment generate some respect for teacher in student!
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You
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Hey all,
thanks to all for ur response.
iam trying to create a listcontrol with 2 columns
I do the following inside OnInitDialog()
m_List1.InsertColumn(0,"column1");
m_List1.InsertColumn(1,"column2");
but how do i insert values. ie., Column1 should have the names like
alex
bob
Cathy
...
...
Column2 their age.
5
12
13
..
..
how do i add these items to the respective columns.
I know I should use InsertItem.
But where in code do I put it ..inside which function.?
Also how to indicate which column it has to be inserted?
Thanks in advance.
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m_List1.InsertColumn(0,"column1");<br />
m_List1.InsertColumn(1,"column2");<br />
<br />
m_List1.AddItem(0, 0, "data for column 1");<br />
m_List2.AddItem(0, 1, "data for column 2");
The first parameter is the row index, and the second parameter is the column or subitem index.
- S
50 cups of coffee and you know it's on!
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