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#include <iostream>
bool IsPrime (unsigned int);
int main(int argc, char* argv[])
{
unsigned int max;
cout << "Give an integer number: "; cout.flush;
cin >> max;
cout << endl;
for (unsigned int n = 1; n <= max; n++)
if (IsPrime(n))
{
cout << n << ", ";
cout.flush;
}
cout << endl;
return 0;
}
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DaFrawg wrote:
I don't know how you are going to check that, there are several ways to do that
then why did u posted this ?
redindian
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I'm not making his homework. I just give him a sample skeleton, not the solution. Sure I know a way to find out if it is a prime or not, I've done that before. But if you can't think of one by yourself, you just have to take math classes.
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herez one way of doing it.....;)
#include<iostream.h>
#include<conio.h>
void main(void)
{
int number;
BOOL flag=0;
clrscr();
cout<<"Enter the number : ";
cin>>number;
cout<<"The numbers are :"\n";
for(int j=1;j<=number;j++)
{
flag=0;//reset the flag.....
for(int i=1;i<j/2 && flag==0;i++)
{
if(j%i==0)//if no remainder.....then set the flag
flag=1;
}//end of for(int i=1;i<j/2 && flag==0;i++)
if(flag==0)
cout<<j<<"\n";
}//end of for(int j=0;j<=number;j++)
}//end of void main(void)
hope that helpz.....
cheerz.....
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Looks like homework to me, so I won't give you answers. I don't like the ones others have given, though they will work. (I even have a book someplace that tells how to check if a number is prime, but it fails on Newton primes - I can't recall exactly what they are called)
What I would do, and what I suspect your professor wants: create a linked list of all known primes, up to the current number. This list starts empty. You start by checking the lowest unknown number against the list. If anything in the list divides your number it is not prime. If the number is prime place it in the list. Either way move to the next highest number.
If this isn't enough, google will reveal several C programs that do the same thing. Don't bother handing them in though. Professors are fairly good at spotting those programs even after students hide the origions. Besides, I might get a job with you latter, and I'll want you to have done the work then.
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I have not been working on a native C++ program of mine for a while and today I tried to compile it (using Visual C++ .NET 2003) and I got the error:
Command line error D2022 : cannot open 'o:\...\Debug\RSP00000F.rsp'
Does anyone have any idea what is going on? 
Happy Programming and may God bless!
"Your coding practices might be buggy, but your code is always right."
Internet::WWW::CodeProject::bneacetp
N-Tech Productions
http://www.n-tp.com/
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I am trying to find some code that pulls off the RIFF, LIST and INFO chunks from a WAV file. I found several articles on the RIFF but I have found few that detail the 'LIST' or 'INFO' chunks of a WAV file. If I could find an article and some code snippet that describes how to extract this information, that would be awesome. As I stated, I found various articles/links that detail what these chunks are composed of but nothing really describes the "how to" of extracing this information. I would like to pull of information such as IART, ICOP, INAM, etc. Does anyone have any good articles/links that describe such a process?
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I need to ensure that the jumps in the inline assembly code I'm writing will always be relative, since the code will be self modyfying, so the same code may be excecuted from muliple memory locations. According to the manual I found, it should be something like this:
jmp SHORT (signed jump bytes)
However, this just gives me a bunch of syntax errors, so does anyone know the correct way?
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Can you tell me please how to pass strings as parameters of a function so we can use them for different purposes?Please help me !!!!
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void foo1( LPCTSTR lpszName )
{
}
or
void foo2( CString &strName )
{
}
...
foo1("My name is...");
CString str("Bob");
foo2(str);
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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you forgot:
<code>include <string>
using std::string
void foo3( string s)
{
}</code>
not to mention char *. Is LPCTSTR a macro that converts to narrow and wide strings ? Then there's BSTR and bstr_t......
Christian
I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer
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I guess it's better to replace
using std::string;
by
using namespace std;
or else the class 'string' will not be available (it's 'std::string', not 'std::string::string').
LPCTSTR is not really a macro:
#define LPCTSTR const char*
(or something like that, I probably forgot the As and Ws for ANSI and Unicode)
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DaFrawg wrote:
I guess it's better to replace
using std::string;
by
using namespace std;
Nope, that's rubbish. That scopes all of namespace std unnecessarily, if std::string is all that is wanted.
DaFrawg wrote:
or else the class 'string' will not be available (it's 'std::string', not 'std::string::string').
You're completely wrong here. I don't even know how you ended up with this theory.
DaFrawg wrote:
LPCTSTR is not really a macro:
#define LPCTSTR const char*
(or something like that, I probably forgot the As and Ws for ANSI and Unicode)
That is, by definition, a macro, just a parameterless one.
Thanks for playing tho. 
Christian
I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer
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Christian Graus wrote:
Nope, that's rubbish. That scopes all of namespace std unnecessarily, if std::string is all that is wanted.
Sorry, I didn't know that there was something like "using Declaration".
MSDN: "The using declaration introduces a name into the declarative region in which the using declaration appears." 
Christian Graus wrote:
That is, by definition, a macro, just a parameterless one.
Tell that the people who claim they are called "symbolic identifiers". 
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DaFrawg wrote:
Sorry, I didn't know that there was something like "using Declaration".
NP. Glad to help you learn somethng new. The using declaration is better because you control what gets pulled into global scope. Otherwise, you have no real idea.
DaFrawg wrote:
Tell that the people who claim they are called "symbolic identifiers".
They just say that because macros are evil, but a rose by any other name....
Christian
I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer
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Christian Graus wrote:
you forgot:
Technically speaking, yes. Since STL and Unicode are not part of my normal development paradigm, I don't often think of them.
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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*grin* To be honest, Unicode has never figured highly in my thoughts either. But I was always an STL junkie
Christian
I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer
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I am new to C++ I have created a member function and I am trying to access a control in the function.
The function:
void CDialog1Dlg::PutCh()
{
char X;
while ((X=GetDataOut()) != 0)
{
m_Edit1= m_Edit1 + X;
UpdateData(FALSE);
}
}
I am tring to call this function from the same class.
This gives me an error:
static void DataRead(void)
{
char a;
BOOL fWaitingOnRead = FALSE;
while (1)
{
a=0;
Status = ReadFile (hnd, &a, 1,&rCount, NULL);
if (Status && rCount > 0)
{
if (a)
{
if (a == 13)
{
PutDataIn('\r');
PutDataIn('\n');
}
else
PutDataIn(a);
}
}
CDialog1Dlg::PutCh() <------- I get an error here
Sleep(1);
}
}
Without adding the CDialog1Dlg::PutCh() line to the function the code compiles fine. My question is how do I call this member function from another function inside the class. I would just like to be able to access m_Edit1 control.
Thanks,
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It's best practice to tell people the error you are getting. In this case, you're trying to call a method that is not static, and therefore requires an instance of your class. If you make your other method static, you should be fine ( assuming GetDataOut is static ). Otherwise you need to create a new instance of the class, and use that to call the method.
Christian
I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer
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You have defined PutCh() as a class member function and you're calling it from a function not related to that class.
PutCh() only makes sense in context of some object that you created from your class. You can't just call PutCh() from anywhere because what will the variable m_Edit1 represent? You may have 10 objects each with its own copy of m_Edit1, which one will PutCh() modify?
So you need to specify the object name when you're calling that function
MyObject.PutCh();
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Does DataRead need to be static? If not remove the static and the program should compile fine.
John
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I have a main class Dialog1.cpp:
That instantiats the diolog class:
CDialog1Dlg dlg;
dlgptr = &dlg;
m_pMainWnd = &dlg;
int nResponse = dlg.DoModal();
I then have a dialog class called Dialog1Dlg.cpp. This class has the functions I wish to call.
I have removed the static from the read data function.
I have these functions:
char GetDataOut()
{
char Data;
if (Start == End)
return 0;
Data = strData[Start];
if (++Start >= Max)Start = 0;
return Data;
}
void PutDataIn(char X)
{
int TEnd = End;
if(++TEnd >= Max) TEnd = 0;
if(TEnd != Start)
strData[End] = X;
End = TEnd;
}
void DataRead(void)
{
char a;
while (1)
{
a=0;
Status = ReadFile (hnd, &a, 1,&rCount, NULL);
if (Status && rCount > 0)
{
if (a)
{
if (a == 13)
{
PutDataIn('\r');
PutDataIn('\n');
}
else
PutDataIn(a);
dlg.PutCh(); <--- this is undefined
}
}
Sleep(1);
}
}
DataRead is a thread that I spawn at init.
I have tried to create a new object of the same type but UpdatData(FALSE) gives me a runtime error.
I know I am not doing something, I just do not know what.
Any ideas?
Thanks,
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dlg.PutCh() is undefined because dlg is not defined in DataRead(). I did not know you were using threads.
There is an easy solution. Post your code that creates the thread and I will give you some help. Part of the solution is returning DataRead back to a static member function but with passing a pointer to the class.
In your header file for CDialog1Dlg add this to the CDialog1Dlg class:
static unsigned DataRead(LPVOID lParam);
Now in your CPP file:
unsigned CDialog1Dlg::DataRead(LPVOID lParam)<br>
{
CDialog1Dlg* pThis = reinterpret_cast<CDialog1Dlg*>(lParam);
pThis->PutCh();
return 0;
}
John
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void CDialog1Dlg::PutCh()
{
char X;
while ((X=GetDataOut()) != 0)
{
m_Edit1 = X; <-------------Error when I get here (see below)
UpdateData(FALSE);
}
}
First-chance exception in Dialog1.exe (MFC42D.DLL): 0xC0000005: Access Violation.
Did not get this before.
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Hello,
I have a SDI project, where from a menu selection I create many modeless dialog Windows. I dont have focus on any particular user dialog box, but if I happen to press the Enter key, the Window closes...but the program thinks it is still open. I have code already that allows me to close each Window, but that is not causing this problem. I am not sure where in the code I am where I click the Enter key.
Does anyone know how I might cure/find this problem??
Thanks,
Jerry
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