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cppcook wrote: If you couldn't figure out the problem, why don't you write your own pow() function? It's simple...
Simple for integer exponents ... not so simple for decimal exponents.
As for the original post, my guess is that you are mixing types (that is, raising a double by an integer power). While there is nothing wrong with that, pow is usually defined:
From MSDN:
double pow(
double x,
double y
);
double pow(
double x,
int y
);
double pow(
int x,
int y
);
float pow(
float x,
float y
);
float pow(
float x,
int y
);
long double pow(
long double x,
long double y
);
long double pow(
long double x,
int y
);
float powf(
float x,
float y
);
Try explicitly casting your types:
double base = 3.0;
int power = 5;
int result = pow(base, (double)power);
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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Is a result of implicit casts being available. Explicitly case each parameter to the datatype to use that matches one of the pow formal parameter lists.
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
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If you know nothing about function overloading just cast both parameters to (double) and it will compile.
tempDistance += pow(((double)data[selectedInstance][k]-data[j][k]),2.0);
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Thanks all for the replies.......i used the simple way and cast both parameters to double and it can work now.
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Hi everyone,
I have an Edit box in a dialog with multiline property and four scroll bar properties checked. A text file is read into the edit box. The file is tab spaced structured data file (40 rows, but with thousands of columns). The problem is the edit box will break the row in the original file into several rows and display it. This makes the data looks unstructured and disordered. I know this is because the row is too long so the Edit box wraps words automatically. But can we avoid this?
thanks,
gavin
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Does the WS_HSCROLL style help?
"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank
"Judge not by the eye but by the heart." - Native American Proverb
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Thanks David,
I checked all the four scroll properties, Horizontal scroll, Auto Hscroll, Vertical Scroll, Auto Vscroll. But it didn't help.
Gavin
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Does your text happen to have any embedded CR OR LF characters in it? I just tried this by entering a long line of text into a narrow edit control and it scrolled vertically until I hit Enter.
"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank
"Judge not by the eye but by the heart." - Native American Proverb
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Yes. The text file has newline characters in it. The edit box will jump to a new line after a limited length of characters even if it doesn't meet a CR or LF character. While this is not what I want. thanks anyway.
gavin
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Looking at this syntax, I can't quite see what the end result should be. What does this function return?
long comm_fm_node_id(comm_fm_dev_t *dev, long group) {
return (group == 0) ? MCAST_nodeid : -1;
}
Patrick
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if(group == 0)
return MCAST_nodeid;
else
return -1;
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it means :
long comm_fm_node_id(comm_fm_dev_t *dev, long group) {
if (group == 0) {
return MCAST_nodeid;
}
else {
return -1;
}
}
but i really don't see what dev is passed to the function if it doesn't use it, and i suspect MCAST_nodeid to be a global variable...
TOXCCT >>> GEII power
[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]
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Dev isn't used because it's only a partial implementation... I'm trying to finish the implementation... 
Thanks for your help.
Patrick
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pgav wrote: long comm_fm_node_id(comm_fm_dev_t *dev, long group) {
return (group == 0) ? MCAST_nodeid : -1;
}
By the way, be VERY judicious when using the ternary operator (which is what the expression ? result_if_true : result_if_false is called). Most of the time, it is far more clear to write:
if (expression)
{
return SomeValue;
}
else
{
return SomeOtherValue;
}
I can't tell you how many bugs I've run into because people tried to get fancy with the ternary operator and do things like:
return expression1 ? expression2 ? expression4 ? 1 : 0 : 3 : expression3 ? 2 : 4;
If you run into something like that, you should hunt down the person who wrote it, take them out behind your office, and ... well, you get the idea.
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,
Is any one aware of a technique of easily putting a breakpoint in every function in a solution (MSDev.Net 2003).
I'm currently having to make some modifications to the Firebird 1.5 source code and finding where it is called when a user calls connection.setAutoCommit(false); from a Java Servlet is turning out quite time consuming.
Thanks
Tom
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Hey guys,
Im working with winsocket in one of my projects and I have some questions regarding Windows Sockets. I see that it is used to send data over the TCP/ IP network protocol but why is it specifically called Windows socket? If I try running two different simulations which interact with one another over a network, do both of the simulations have to be running on the WINDOWS OPERATING SYSTEM? If anyone has any links that can give me the basic understanding of what goes on in the Windows Socket it would be greatly appreciated
Thanks,
Jay
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WinSock is just the library name. It is basically Microsoft's implementation of the Berkeley sockets that are used on *Nix systems. From a development point of view, there is very little different in the way of method calls, arguments, etc (outside of initializing and freeing the library). When using it, you can communicate with anything that talks TCP/IP, regardless of the OS. Just make sure you keep byte-ordering in mind when programming.
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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Jay03 wrote: If I try running two different simulations which interact with one another over a network, do both of the simulations have to be running on the WINDOWS OPERATING SYSTEM?
No. That's the beauty of TCP. Neither end has to be concerned with the other (e.g., Windows <-> Unix <-> OS/400). They just both have to speak the same language. This is a somewhat simplified explanation. See here for more on TCP. See here for more on the OSI model.
"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank
"Judge not by the eye but by the heart." - Native American Proverb
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TCP doesn't inherently care about different architectures, but some care (see ntohl and htonl) has to be taken to make sure that the data you send (you just hand the functions a hunk of memory) isn't architecture / OS dependent.
earl
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Great answers guys....... thanks a lot!
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Hi,
I'm an embedded C programmer trying to migrate a set of makefiles from using VC6 tools (with msdev.exe) to VC++ Express + Platform SDK (with vjproj.exe).
I find vcproj is rather underdocumented. Could someone please help me translate a few lines in the makefiles?
Old: msdev pname.dsw /make ALL /clean
New: vcbuild pname.vcproj /clean
... Could you please tell me if these lines accomplish the same thing? I think using "ALL" told msdev to make all the available configurations, but I can't find an equivalent with vcbuild.
Old: msdev.exe pname.dsw -ex macroName /nologo
New: vcbuild pname.vcproj ???????????????????????
... The -ex flag tells msdev to invoke a macro. I think if I were using VC7 and devenv.exe that I would use /command. I can't find anything similar for vcproj.
Old: msdev pname.dsw /make "FileName - Win32 $(MSDEV_CONFIG)"
New: vcbuild pname.dsw /rebuild /OUT:FileName "$(MSDEV_CONFIG)|Win32"
... I am using /rebuild because I read a post/answer that indicated vcbuild has problems with pre build events, generated cpp files, or projects which have more than one level of depencency, and that /rebuild should alleviate "most" issues. Do you know if this is still the case? Also, am I translating the use of FileName correctly?
Thanks!
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jasper77 wrote: Old: msdev pname.dsw /make ALL /clean
New: vcbuild pname.vcproj /clean
... Could you please tell me if these lines accomplish the same thing? I think using "ALL" told msdev to make all the available configurations, but I can't find an equivalent with vcbuild.
Old: msdev.exe pname.dsw -ex macroName /nologo
New: vcbuild pname.vcproj ???????????????????????
... The -ex flag tells msdev to invoke a macro. I think if I were using VC7 and devenv.exe that I would use /command. I can't find anything similar for vcproj.
Old: msdev pname.dsw /make "FileName - Win32 $(MSDEV_CONFIG)"
New: vcbuild pname.dsw /rebuild /OUT:FileName "$(MSDEV_CONFIG)|Win32"
... I am using /rebuild because I read a post/answer that indicated vcbuild has problems with pre build events, generated cpp files, or projects which have more than one level of depencency, and that /rebuild should alleviate "most" issues. Do you know if this is still the case? Also, am I translating the use of FileName correctly?
Well, I've indentified one problem: the new lines should use .sln instead of .dsw. However, the rest of my questions remain.
Thanks!
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Hello,
I have a dialog with an OK and Cancel button, for example. Until a certain event takes place, the OK button is disabled, and the Cancel button is default (ie: has the thicker black outline). When the event takes place, and the OK button becomes enabled, I want it so that the OK button instantly becomes the only default button. With what keywords can I accomplish this?
Thanks 
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use <a href="http://msdn2.microsoft.com/en-us/library/7sd15kw3.aspx" rel="nofollow">CDialog::SetDefID()</a>[<a href="http://msdn2.microsoft.com/en-us/library/7sd15kw3.aspx" target="_blank" rel="nofollow" title="New Window">^</a>]
for instance :
this->SetDefID(IDOK);
TOXCCT >>> GEII power
[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]
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