VC master please enter 15, VC master please enter!

Setrop2 is to set the painting mode, there are many painting modes, for example, the simplest painting mode is what color your current brush is, what color is drawn on the screen, R2 Notxorpen This painting mode is like this, it first puts the brush color and the screen color XOR, (here XOR is math calculation, 1 and 1 are 0, 1 and 0 are 1, we say that the color is actually a binary number,) XOR and then invert and finally get a color value displayed on the screen.

For example, if you use the R2 Notxorpen painting mode, you draw a straight line on a black background with a red brush, and the red color is displayed, but if you use this pen to redraw the line you just draw, it is equivalent to erasing the red line that you started drawing, and the underlined area is displayed as the background color.

R2 NOT Paint Mode also has the ability to draw twice in the same place to draw nothing, but the first time R2 NOT Paint Mode paints the color, it shows the color not the brush color you selected, but the default color.

That's the difference between these two modes of painting.

r2_notxorpen pixel is the inverse of the r2_xorpen color (final pixel = not(pen xor screen pixel)).

This is where you set the color of the brush to be the color of the screen or the color of the screen, as the color of your line!

r2_not pixel is the inverse of the screen color.

This is done by drawing lines in a color that is the opposite of the color of the screen.

Want to learn VC? I installed the VC and installed the msdn

r2_not pixel is the inverse of the screen color.

The color of the pixel is the color of the current position of the screen, which is inverted;

r2_notxorpen pixel is the inverse of the r2_xorpen color (final pixel = not(pen xor screen pixel)).

First, make the color of the brush XOR with the color of the current position of the screen, and then reverse;

R2 notxorpen XOR brush function.

R2 NOT: A new drawing mode for device scenes.

The former is a console program, that is, an interface with only characters and commands.

The latter is a program based on MFC for Windows graphical interface.

...Go to MFC to figure out the difference between the two.

There should be no problem, how to use dynamic arrays.

1. Include header files.

#include

2. Define the type.

typedef carrayrundata_id_arr;

3. Declaring variables.

rundata_id_arr myarr;

There should be no problem.

Sometimes VC is like this, you keep writing, you can't go wrong.

Close the project, go to the project file path, and deleteNCB file.

Open the project, compile it all over again, and look at it again.

There are write functions that are. Not out.

The smart tips are not good.

Functions can be used, just without prompting.

It's good to know for yourself that you can enter directly.

sizeof(a) is the byte length of the a variable type sizeof(*a) pointer byte length.

pf*17%256)%2 !=0 is changed to pf*17%256)%2 == 0, so that it is an even number.

The serial port can only communicate one-to-one, if you want three computers to communicate, there should be a computer with two serial ports as a server. The server itself is in turn a client.

printf("%d",&a);

Both main and fun have a variable conflict, and usually the nearest region layer is chosen, so a in main is chosen, and your a scope is just the fun() function.

The a here is defined in the main function, not the a variable defined in fun() in your imagination, so 100 times it is the same address, because the a variable in &a printed below is simply the same variable Think about it carefully, hehe, I wish you the better you learn.

It must be the same address, your A is a static variable, although the meaning of the fun function is to reopen the memory every time it is called, but your A is a static address variable, which will not change when it is created for the first time, and will not disappear with the completion of the fun function call, so it is unchanged. You can take a look at the use or storage of static variables.

static int a;Data members at rest.

Data-at-rest members are stored in a global datazone.