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Constant values: public const fields, e.g.
class Port {
public const ushort PORT1 = 0x378,
DataPort = PORT1,
ControlPort = PORT1+2;
}
Functional macros: static methods, e.g.
uint BV(int a) { return 1 << a; }
These will get inlined in release mode, generally. Note that you have to specify the type at compile time, so you might need to change how you use them a bit.
Also note that in C#/.Net everything must be in a class. Put constants and static methods in the class for which they're most appropriate.
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If you really want, you can pass your C# code through a C Preprocessor. 
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C# compiler does not have a preprocessor. The alternative is to use constants. During lexical analysis stage of compilation, these constants are replaced with their actual values.
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Actually it does (or effectively it does); you can use #define, #if/#endif etc and #pragma. But what it can do is far more limited, and in particular you can not define substitution #defines for constants and macros.
You are right in the context of the question asked here, but there are some preprocessor instructions.
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Technically, C# does not have a preprocessor like C/C++ does, but the #define and #if .. #endif are handled at the lexical analysis stage of compilation. So, it is something like a pseudo-preprocessor.
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aeman wrote: in c# without making class??
My first inclination is to just tell you to give up because it is impossible. Stay with C and forget about using C# (or Java.)
One needs to have an attitude that one must look for solutions (plural) to solve problem rather than insisting that one solution is the only possible avenue. And that is in the context that a 'problem' is a business problem not a technical one.
But additionally, as per the other reply, one can note that the C (and C++) preprocessor is in fact really a 'pre' part of the compilation process and as such it can be run independently from the C/C++ language itself. However your macros are not even close to being complex enough that one should even consider that solution.
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hello guys... How can I add a class that is written entirely in C++ (I wrote this class  ). I am just experimenting on how to use both C++ and C# at the same time.
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As long as you have Visual C++ installed, you can add your vcproj file as a project. You can't mix and match C++ and C# in the same project, they must exist in different assemblies. Apparently you can, according to the post below. Well, you live and learn.
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A little known fact about the .NET platform is that you can actually mix more than one language in the same assembly, but it has to be a multi-file assembly. Unfortunately, Visual Studio does not support creation of multi-file assemblies, you can only do it through command line tools. This[^] link contains more information.
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Nice. I've just leared something new. Thanks for that.
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Thanks for the information ... not something I need right now but it might be useful one day!
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Thanks for the information! 5+ 
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overloaded Name wrote: I am just experimenting on how to use both C++ and C# at the same time.
Why?
There are many, many more things in the languages, APIs, and in computing in general that are going to be far, far more useful in terms of spending ones time on it.
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Reusability. If a task is done in one language, lets say I want to print a report (just example) then why do I havae to re write that code in other language. Why can not I use the existing code which is doing the job perfectly?
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Yeah,I am very interesting,for me,i use C++ for major developing and C# just for some special programs.
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Hi,
I am plotting a graph between frequency on x-axis and gain on y-axis.
X-axis(frequency) needs to vary logarithmically and y-axis(gain) needs to vary linearly.
The first step was to create the axis and put numbers on the lines.
As the default origin is at the Left Top corner of the client area, I moved the origin to the center of the client area and inverted the y-axis, so that whatever drawing takes place it should be as per the new origin and looks more realistic.
I tried to create few lines along with string to number them. Lines are drawn properly, however the string also got inverted.
Here is the code, I tried to use. It can be used in any winform application.
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
g.TranslateTransform(this.ClientSize.Width / 2, this.ClientSize.Height / 2);
g.ScaleTransform(1, -1);
Point A = new Point(0, 0);
Point B = new Point(120, 80);
Point C = new Point(120, -80);
g.DrawLine(Pens.Red, A, B);
g.DrawLine(Pens.Green, A, C);
g.DrawLine(Pens.Purple, 0, 0, -50, 70);
g.DrawString("3", new Font("Arial", 16), new SolidBrush(Color.Purple), B);
}
Question 1: How can we draw string after inverting the y-axis?
Question 2: How can we make vertical lines that should vary logarithmically?
Any idea/solution is welcome.
Praveen Raghuvanshi
Software Developer
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Leave the graphics object untranslated and untransformed. Do the y-axis inversion and scaling in separate code instead. That way, you have full control over what is drawn where.
A good idea would be to encapsulate all of that conversion processing so that you can call it using just "normal" values.
Ciao,
luker
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Thanks Lukeer!!!
I tried your suggestion, missed somewhere.
Appreciate if you can help me draw three lines with numbering on them according to the order of drawing them.
I wish to have origin in the center of the window and all points should be given according to that. Y-axis should be positive in the upward direction and negative in the downward direction.
Thanks,
Praveen Raghuvanshi
Software Developer
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Here is a quick proposal with horrible readablility:
private PointF Transform(PointF logicalPoint)
{
float logicalXMin = -100;
float logicalXMax = 100;
float logicalYMin = -100;
float logicalYMax = 100;
float canvasXMin = this.ClientRectangle.Left;
float canvasXMax = this.ClientRectangle.Right;
float canvasYMin = this.ClientRectangle.Top;
float canvasYMax = this.ClientRectangle.Bottom;
float canvasX = ((((float)(Math.Log(logicalPoint.X, 10))) - logicalXMin) / (logicalXMax - logicalXMin) * (canvasXMax - canvasXMin)) + canvasXMin;
float canvasY = ((-logicalPoint.Y - logicalYMin ) / (logicalYMax - logicalYMin) * (canvasYMax - canvasYMin)) + canvasYMin;
return (new PointF(canvasX, canvasY));
}
You use a control as canvas. You have to transform logical co-ordinates into canvas co-ordinates. Therefore you look at your logical value in relation to logical maximum and minimum. Then apply the same relation to canvas minimum and maximum.
Since canvas Y-axis is inverted, you have to use negative logical Y value to compensate.
As mathematics dictates, you can't use negative X values here.
Draw grid lines using logical co-ordinates. They should get processed just as any data point.
for( int power = 0, power < 4, power++)
{
g.DrawLine( gridPen, Math.Pow(1, power), logicalYMin, Math.Pow(1, power), logicalYMax);
g.DrawLine( gridPen, Math.Pow(2, power), logicalYMin, Math.Pow(2, power), logicalYMax);
g.DrawLine( gridPen, Math.Pow(5, power), logicalYMin, Math.Pow(5, power), logicalYMax);
}Horizontal grid lines should be even easier.
for( int i = logicalYMin; i <= logicalYMax; i += 10)
{
g.DrawLine( gridPen, logicalXMin, i, logicalXMax, i);
}
Ciao,
luker
modified on Wednesday, July 13, 2011 7:17 AM
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Thanks, I will give a shot.
Praveen Raghuvanshi
Software Developer
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As Lukeer says, you should calculate the canvas position from chart coordinates yourself. Using translate and scale seems clever but as you've discovered it causes text to be drawn upside down as well.
When I draw a log chart I still place gridlines linearly but label them logarithmically (e.g. 0.5, 1, 2, 4, or 1, 10, 100, 1000). I find the 'log graphpaper' approach to be fussy and generally not helpful. But if you want to do that then it is easy enough to calculate the appropriate chart coordinate Y values (log y at sensible Y values such as 1, 2, 5 each power of 10), and then you can transform those like all the other things for drawing.
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