C / C++ / MFC Discussion Boards

Re: convert from size_t to unsigned int

George_George28-Jul-07 21:55

George_George

28-Jul-07 21:55

Hi bob16972,

static_cast is an operator in C++, how do you think we can use it in pure C program?

regards,
George

Re: convert from size_t to unsigned int

bob1697229-Jul-07 18:13

bob16972

29-Jul-07 18:13

Considering this is a C++ forum, I assumed you were using .cpp files. If you are truly using .c files then my apologies. I haven't compiled a "pure" C program since 1992 or 1993.

Either way, I don't use static_cast myself so no harm no foul.

Re: convert from size_t to unsigned int

George_George29-Jul-07 18:25

George_George

29-Jul-07 18:25

Thanks bob16972,

It is ok.

regards,
George

Re: convert from size_t to unsigned int

Mark Salsbery28-Jul-07 6:44

Mark Salsbery

28-Jul-07 6:44

If you don't care about 64-bit compatibility warnings, why not turn the 64-bit compatibility check
off in the compiler settings?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: convert from size_t to unsigned int

George_George28-Jul-07 19:34

George_George

28-Jul-07 19:34

Thanks for your new idea, Mark!

Do you know how to turn 64-bit compatibility back? Which compiler settings (macros) should I look into?

regards,
George

Re: convert from size_t to unsigned int

Mark Salsbery30-Jul-07 4:53

Mark Salsbery

30-Jul-07 4:53

I'm still not sure if that's why you're getting the warning. I thought you stated you tried
unsigned int instead of int in an earlier post - if that's the case then it's probably a 64-bit
compatibility warning.

If you go to the project properties, the C++/General page should have the "detect 64-bit portability
issues" switch.

There's also #pragma warning for turning on/off warnings for sections of code.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: convert from size_t to unsigned int

George_George30-Jul-07 18:54

George_George

30-Jul-07 18:54

Thanks for your advice, Mark!

regards,
George

Re: convert from size_t to unsigned int

Stephen Hewitt29-Jul-07 15:06

Stephen Hewitt

29-Jul-07 15:06

size_t in unsigned but int is signed.

Steve

Re: convert from size_t to unsigned int

George_George29-Jul-07 18:24

George_George

29-Jul-07 18:24

Hi Stephen,

If I am converting size_t to unsigned int on 32-bit platform, are there any risks of data lost?

regards,
George

Re: convert from size_t to unsigned int

Stephen Hewitt29-Jul-07 18:26

Stephen Hewitt

29-Jul-07 18:26

It depends on how the conversion is done. Why not use size_t directly. If you can't perhaps unsigned int would be a closer match.

Steve

Re: convert from size_t to unsigned int

George_George29-Jul-07 18:57

George_George

29-Jul-07 18:57

Good idea Steve,

I will try to change the function signature (parameter type).

regards,
George

How to search a value of a variable of an object in a list of objects

beriho27-Jul-07 20:24

beriho

27-Jul-07 20:24

Hi all;

I am (new to c++) trying to write a program which in part of it has a list of objects with a few variables.(pseudo code)
lets say:
class cObj
{
private:
int objNum;
string objName;
}

list<cobj> ListObj;

and we have three objects
obj1 ( onjNum =1 , ObjName = One)
obj2 ( onjNum =2 , ObjName = Two)
obj3 ( onjNum =3 , ObjName = Two)

and i want to search all the objects that have the name "Two".
result should be: &Obj2 and &Obj3 (or pointers)
how can i do it?

thanks a lot;

Beri

Re: How to search a value of a variable of an object in a list of objects

Christian Graus27-Jul-07 20:41

Christian Graus

27-Jul-07 20:41

If you store then in a vector, you can write a functor to do the search you are after and use the built in search algorithms.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: How to search a value of a variable of an object in a list of objects [modified]

beriho27-Jul-07 20:58

beriho

27-Jul-07 20:58

thanks for you kind help!

i see, vector has a random access to any position.
but if i had to use a list(not only because i wrote a very long code :P)?

isn't there any option to check something like this:
lets say i have a function:
bool mysearch( string _objName)
{
int found = 0;
list::iterator iter;
iter = list.begin();
while(iter!=list.end())
{
if(iter.objName== _objName) //iter.objName is my problem - how to implement
found++ // get the times objName found
}
}

thanks a lot;

Beri

-- modified at 3:12 Saturday 28th July, 2007

Re: How to search a value of a variable of an object in a list of objects

Eytukan28-Jul-07 5:18

Eytukan

28-Jul-07 5:18

You should overload the == operator and use the find algorithm.

<br />
class cObj<br />
{<br />
	int objNum;<br />
        string objName;<br />

Below,you can actually have the int type as well that you can check for your "2" directly than passing it from an object. But in case you want to change the search condition sometime later, this doesnt help. Better pass the object and get the member from it.

<br />
	bool operator == (const cObjSent)//int here if you want<br />
	{  <br />
		return ((objNum==cObjSent.objNum));<br />
	}<br />
}<br />
<br />
void main()<br />
{<br />
list <cObj> cObjObject;<br />
list <cObj> ::iterator cObj_iter;<br />
<br />
cObj_iter = find(cObjObject.begin(), cObjObject.end(), YOUR_COBJ_SEARCHOBJECT_HERE

[Like for eg:your obj2]

);<br />
<br />
//cObj_iter has the result.<br />
}<br />
<br />

He's become a household word in the Lounge. A whole new phraseology has evolved. Post a link or reply with a smiley and rose, and you've made a "Satipsism". So what? It's an interesting thing about the Internet, the evolution (as in change, not progress) of tone, quality, terminology, etc.

-Marc Clifton.

Best wishes to Rexx[^

Re: How to search a value of a variable of an object in a list of objects

beriho28-Jul-07 6:22

beriho

28-Jul-07 6:22

thanks a lot Marc!

May The Force Be With You...

Progress bar in list ctrl

neha.agarwal2727-Jul-07 19:31

neha.agarwal27

27-Jul-07 19:31

Hi all i want to make progress bar inside list control(report style). I have found various articles regarding this but they don't fulfil my requirements.
i have made a sdi application and that sdi window is divided with a vertical splitter controls in two parts.Each veiw is derived from CFormVeiw and have a list control in it.I want to make progress bar in my list control and that progress bar should start when i click a button on toolbar.

How to do this.....

Thanks in advance

Re: Progress bar in list ctrl

SandipG 30-Jul-07 1:51

SandipG

30-Jul-07 1:51

There are very good examples regarding this on codeproject i dont remember exact names but try something XListControl you will get it.

Re: Progress bar in list ctrl

Hamid_RT31-Jul-07 21:06

Hamid_RT

31-Jul-07 21:06

See XListCtrl - A custom-draw list control with subitem formatting[^]

WhiteSky

how to print with commas..

dalmar mahamoud27-Jul-07 19:02

dalmar mahamoud

27-Jul-07 19:02

Hi,
I want to write a program that when I input integer then the output will have commas if it has more than three digits. For example,
-2007 and 2000000 would be printed as -2,007 and 2,000,000 respectively..

# include <iostream>
# include <iomanip>
using namespace std;

int main ()

{

double digit;
cout <<" print it with comma "<< endl;
cin >> digit;
cout <<setiosflags(ios::fixed| ios::showpoint)<< setprecision(3) <<endl;
cout <<digit <<endl;

return 0;

}

dalmar mahamoud

Re: how to print with commas..

Paul Conrad27-Jul-07 19:38

Paul Conrad

27-Jul-07 19:38

This really sounds like a homework problem. It is not that difficult to do.

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Just curious.

dellthinker27-Jul-07 15:32

dellthinker

27-Jul-07 15:32

Hi all. Is it possible to have a program that executes under a different name under Windows? For example, program.exe executes under newprogramname.exe? Only reason why i asked is because i've always wandered how installation programs do it. Thanx in advance!

Re: Just curious.

codemunkeh27-Jul-07 16:14

codemunkeh

27-Jul-07 16:14

I don't think it's possible. If it was, it would be a heck of a security vulnerability - unless the full path was placed somewhere, it would screw up every piece of anti-virus software in the world.

Install programs execute under the same name, as far as I know. It's just that they sometimes create temporary apps and run them as children.

Ninja (the Nerd)

Confused? You will be...

Re: Just curious.

Paul Conrad27-Jul-07 19:40

Paul Conrad

27-Jul-07 19:40

I don't think it is possible, and could be suspicious...

"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon

Re: Just curious.

John R. Shaw28-Jul-07 0:22

John R. Shaw

28-Jul-07 0:22

Yes!

I do not know what ‘Ninja-the-Nerd’ was talking about, but you can change the name all you want. What that has to do with installation I have no clue – so obviously I have no idea what you are talking about.

If you do not believe me – pick a program and rename it through the explorer and then run it.

The only problem that might occur is if that program was specified as the one used to handle a particular file format. If you change its name – then the system will not know what program to use (now), unless you tell it what the new name is.

Well actually – depending on the program – there could be other problems (rarely) if other programs depend on that one (a.k.a. file type handling). But let’s not go there or we will all end up with a head ache .

INTP
"Program testing can be used to show the presence of bugs, but never to show their absence."Edsger Dijkstra

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