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Ben, thanks a lot. This is the answer that I was searching. I needed this cause I'm developing an app that needs to generate little images based on screen resolution.
Thanks a lot for you.
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hi every one this is for the first time i am logged to this web site and i am a newbe to programming world and facing problems to implement simple programs
can u tell me with source code how to implement
--- binary serach program
--- finding out a plaindrome
---- what is fibonacii series program
and sorting algorithms like bubble sort and selection sort
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gunwinder wrote: --- binary serach program
you meant binary search, didn't you ?
google[^]
gunwinder wrote: --- finding out a plaindrome
you meant palindrom, didn't you ?
google again[^] have some answers for you
gunwinder wrote: ---- what is fibonacii series program
you mean fibonacci, didn't you ?
guess what ? google[^] have the answer
TOXCCT >>> GEII power [toxcct][VisualCalc]
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How to detect if the keyboard is connected or not.
i am using win98 and XP.
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How can I initialize elements of arrays along with its dynamic creation?
For eg:
char ch(0);
This will initialize the ch with zero.
But the following is not possible.
char* ar = new char[20](0);
Is there any method to obtain the intended result?
Thanks!
- NS -
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NS17 wrote: char* ar = new char[20](0);
Is there any method to obtain the intended result?
what about this?
char* ar = new char[20];
memset(ar,'0',20);
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Well, 0 and '0' differ. I strongly recommend
std::vector<char> ch(20);
--
The Blog: Bits and Pieces
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I'm sorry!
I asked about a general method, not just for a char array.
I need to know, how to initialize an array of objects of a class. In this case memcpy will not be an effective method if the class contains any dynamic allocation/initialization during class object initialization.
For eg suppose the constructor of class C
C::C(int nMin)
{
m_nVals = (rand() % 10) + nMin;
m_ptr = new int( m_nVals );
...
...
}
Thanks!
- NS -
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You're still not being very precise about what you want to accomplish.
m_ptr = new int( m_nVals ); You do know that this creates an int and initializes it to m_nVals , right?
If you still haven't read the suggestion on std::vector , then I suggest you do that and its documentation.
If you want each item initialized differently, then you should have said so - std::vector can only initialize all items to the same value.
--
The Blog: Bits and Pieces
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It was a mistake.
I meant that
m_ptr = new int [ m_nVals ]
I'm not familar with std::vector.
Can you suggest any further references on std::vector?
Thank you.
- NS -
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Are you asking about this scenario?
class myClass
{
public:
myClass();
};
void main()
{
myClass *objArr=new myClass[20];
}
If so, in this case class's default constructor get called. You need to write one to get this compiled.
And that is your chance for any initialization. This is by design
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does anybody know any free tools for format source code?
I know the .NET IDE menu include "Format selection" sub menu,
but, it's not good at format the whole document.
so, do you know the other free tool for format code?
thank you very much.
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Hi,
A bit late in the day, but you could check out http://www.sourceforge.net/projects/astyle. It is a free ware syntax styling and indenting programme for C/C++/java/C#.
regards,
Rich
"Programming today is a race between software engineers striving to build bigger and
better idiot-proof programs, and the Universe trying to produce bigger and better idiots.
So far the Universe is winning." -- Rich Cook
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Ok here i am again the CP having hit my head on the wall as much as possible for this 2 days...
It was more that 1 year i didn't do anything in C#...
now after a lot of ice on my head i got it, my CDAWG
(Word here is a byte pointer)
the class is finally working, it takes imput strings, convert them to bytes and fill the tree... it's very unsafe.... i use ** and * with a clas for the heap memory allocation taken from the examples of the msdn very short code and always worked fine, this is why i am posting to c++ also.
What can i do now???
that's what i did, i took the wikipedia dump file with all their articles names, one per line.
it's 25Mb of a text that have an article name per line...
cool i'm loading it into my class.. and it does the insertion quite faster then what i thought.
the test on word are just WOW.. i mean... almost "instant"
but now the stuff is... why does it take 130Mb of Memory? shoudn't the tree be
"Compact"?
What i wanted to know is if any of you may tell me if this result is "normal"
should a 25Mb file made with one word per line take up to 130Mb when loaded into an normal CDAWG???
<- true inside to understand outside ->
<- true inside to understand outside ->
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Why in Child if I don't specifically call base case and member object's copy ctor, their default ctor is called respectively instead?
#include <iostream>
using namespace std;
class Parent
{
int i;
public:
Parent(int ii) : i(ii) {
cout << "Parent(int ii)\n";
}
Parent(const Parent& b) : i(b.i) {
cout << "Parent(const Parent&)\n";
}
Parent() : i(0) { cout << "Parent()\n"; } friend ostream&
operator<<(ostream& os, const Parent& b) {
return os << "Parent: " << b.i << endl;
}
};
class Member
{
int i;
public:
Member(int ii) : i(ii) {
cout << "Member(int ii)\n";
}
Member(){ cout << "Member()\n"; }
Member(const Member& m) : i(m.i) {
cout << "Member(const Member&)\n";
}
friend ostream&
operator<<(ostream& os, const Member& m) {return os << "Member: " << m.i << endl;
}
};
class Child : public Parent
{
int i;
Member m;
public:
Child(int ii) : Parent(ii), i(ii), m(ii) {
cout << "Child(int ii)\n";
}
Child(const Child& c) : i(c.i) {}
friend ostream&
operator<<(ostream& os, const Child& c){
return os << (Parent&)c << c.m
<< "Child: " << c.i << endl;
}
};
int main() {
Child c(2);
cout << "calling copy-constructor: " << endl;
Child c2 = c;
cout << "values in c2:\n" << c2;
getchar();
}
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Since you've chosen to implement a copy assignment ctor, you really have to do it properly. It's a ctor and it's up to you to choose how to initialize bases and members, just as with the default ctor. When you implement a copy assignment ctor, it's your responsibility to initialize everything correctly. If you don't provide specific initialization for bases or members, their default ctors are used for initialization.
If you don't implement a copy assignment ctor, the compiler will generate one that makes binary copies of PODs and calls copy assignment ctors where such are available.
--
The Blog: Bits and Pieces
-- modified at 2:29 Thursday 20th October, 2005
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Johann Gerell wrote: If you don't provide specific initialization for bases or members, their default ctors are used for initialization.
This sentence is helpful for me to understand, thanks!
Johann Gerell wrote: PODs
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Hi
I currently use an implementation of the GoF observer pattern in C++. i.e. my observing class connects to a subject and then receives updates when it changes state. Having now waded into the Managed C++ arena I find the need to propagate the update call up into Managed C++ world from Unmanaged. My observers inherit from a class much like this:
class Observer
{
public:
virtual void Update(void) = 0;
}
I would love to be able to do the following:
__gc class MyObserver : public Observer
{
...
}
problem solved, but no, __gc classes cannot inherit from __nogc classes. I would like to find an approach which mimicks my existing technique as closely as possible.
Thanks
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You might read this information from MSDN:
Interoperation with Unmanaged Code[^]
Also, here's more:
Interoperability in Managed Extensions for C++[^]
Interop is a complex subject. It kind of depends on what exactly you want to Interop with. Is this a compiled DLL? A COM type library? Or, just a bunch of text source code? Most importantly are the data types compatible?
If it was me, I'd just rewrite everything in .NET framework.
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I'd like to write a command line program that expands command-line arguments just like typical DOS commands, like dir/ren/copy etc.
For example, if I typed "myprog *.doc" my program would get as its arguments the filenames of all doc files in the current directory.
I suppose I could write my own code to do this, but it seemed pretty standard and I was surprised to not find other code that does this.
-Ben
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I think there's an API which takes that string and returns all the files to match.
If not, there's always this[^].
Christian Graus - Microsoft MVP - C++
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Hi,
I know there is an Internet&Networking category, but most of the articles there are for Windows.
Can someone guide me, or tell me a book, on Internet(Server/Client architecture) programming which is independent of the OS is running on?
Thanx!
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sir,
i am confused about virtual functions, what is neccessity of virtual function.in which conditions we make fuctions as virtual .plz tell me about virtual functions
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