C / C++ / MFC

yike wrote:

Could you recommend any good C or C++ compilers on Microsoft Windows

yike wrote:

library available to it.

yike wrote:

if the library contain integrators such as Runge-Kutta etc

Somethings seem HARD to do, until we know how to do them.
_AnShUmAn_

kamalesh82 wrote:

I've to create the "find string option in a particular file" with key board enable "Ctrl+F"

Somethings seem HARD to do, until we know how to do them.
_AnShUmAn_

RockyJames wrote:

I want to the setrange as 0 to 200

RockyJames wrote:

the steps of increment tha has to be done in,first edidbox when click in spin control.

Somethings seem HARD to do, until we know how to do them.
_AnShUmAn_

RockyJames wrote:

value in first editbox has to updated based on the interval specified in second editbox.

void CYourDlg::OnDeltaposSpin1(NMHDR *pNMHDR, LRESULT *pResult)
{
	LPNMUPDOWN pNMUpDown = reinterpret_cast<LPNMUPDOWN>(pNMHDR);
        if(m_strEdit2.GetWindowTextLength()>0) //add this if condition
	{
	   CString s;
	   m_strEdit1.GetWindowText (s);
	   int i=atoi(s);
	   CString t;
	   m_strEdit2 .GetWindowText (t);
	   int j=atoi(t);
	   pNMUpDown ->iDelta =j;
	   CString u;u.Format ("%d",i+j);
	   m_st rEdit1.SetWindowText (u);
	}
	else   // Add this block
	{
		CString x;
		x.Format ("%d",pNMUpDown ->iPos );
		m_strEdit1.SetWindowText (x);
	}
	*pResult = 0;
}

CWnd *wnd=GetWindow (IDC_EDIT1);
m_Spin.SetBuddy (wnd);
m_Spin.SetRange (0,200);
m_strEdit1.SetWindowText ("0");

Somethings seem HARD to do, until we know how to do them.
_AnShUmAn_

UDACCEL updown;
CString t;
m_strEdit2 .GetWindowText (t);
int j=atoi(t);
updown.nInc =j;
updown.nSec =1;
m_Spin.SetAccel (1,&updown);
CString str;
str.Format ("%d",pNMUpDown ->iPos );
m_strEdit1.SetWindowText (str);

Somethings seem HARD to do, until we know how to do them.
_AnShUmAn_

// inc.h
#ifndef __INC_H__
#define __INC_H__
int x;
#endif

// src1.cpp
#include "inc.h"

// src2.cpp
#include "inc.h"

1. The preprocessor processes the file src1.cpp file. It will replace the #include-line with the contents of inc.h. The net effect of this would be a single line in src1.cpp, declaring an int variable with name x. No problems so far.
   
2. The preprocessor sends the processed code to the compiler, which sees the variable declaration. No problems so far. An object code file is produced: src1.obj
   
3. The preprocessor processes the file src2.cpp. As with src1.cpp, its contents will be the same (because it includes the same include file). No problems so far.
   
4. Same thing here as in 2). The compiler sees the variable declaration. Since src1.cpp and src2.cpp are compiled independently, there is no name collision. The variable declared in src1.cpp is not seen by the compiler in src2.cpp. No problems here either. src2.obj is produced.
   
5. All source files have been compiled, so it's time for the linker. The linker examines all object files before it attempts to join them into an .exe-file. What it looks for is to make sure that names are not colliding. In this case, the linker will see that both src1.obj and src2.obj declares a variable with the name x. That is an error, because x is no longer unique - which memory location does x refer to? It can be one of two - and that is something the linker does not like! That is also the error you had in your project.
   

// inc.h
#ifndef __INC_H__
#define __INC_H__
extern int x; // Notice the extern keyword
#endif // __INC_H__

// src1.cpp
#include "inc.h"
int x; // this is the actual declaration of the variable

// src2.cpp
#include "inc.h"

#ifndef _MAPHANDLING_H_<br />
#define _MAPHANDLING_H_<br />
<br />
#include "Includes.h" // C++ and SDL headers<br />
<br />
namespace MapHandling<br />
{<br />
    struct TileFile<br />
    { <struct goes here> };<br />
<br />
	extern TileFile Tilesets[1];<br />
	extern void LoadTiles();<br />
};<br />
<br />
#endif // _MAPHANDLING_H_<br />

#include "MapHandling.h"<br />
<br />
MapHandling::TileFile MapHandling::Tilesets[1];<br />
<br />
void MapHandling::LoadTiles()<br />
{ <func goes here> }<br />

Jörgen Sigvardsson wrote:

Good luck with your project!

Windows Calculator told me I will die at 28.