Mouse interrupt handling

This example is designed to ask you to clean the screen by clicking mouse.

In the code, the following line must be included:

#define KEY_DOWN(VK_NONAME) ((GetAsyncKeyState(VK_NONAME) & 0x8000) ? 1:0)

In addition, VK_LBUTTON, VK_RBUTTON, VK_MBUTTON indicate left button, Right button, Middle button respectively.

//Example

#include

#include

#define KEY_DOWN(VK_NONAME) ((GetAsyncKeyState(VK_NONAME) & 0x8000) ? 1:0) //Must have this line

using namespace std;

int main()

{

while (1)

{

printf("Trick or treat. Smell my feet. Give me something good to eat. ONLY CLICK TO CLEAN THE SCREEN ");

if (KEY_DOWN(VK_LBUTTON))

{

printf("Left click to clean the screen. Pause 1 second.");

Sleep(1000);//pause 1 second

system("cls");//Clean the screen

}

if (KEY_DOWN(VK_RBUTTON))

{

printf("Right click to clean the screen. Pause 1 second.");

Sleep(1000);//pause 1 second

system("cls");//Clean the screen

}

if (KEY_DOWN(VK_MBUTTON))

{

printf("Middle click to clean the screen. Pause 1 second.");

Sleep(1000);//pause 1 second

system("cls");//Clean the screen

}

Sleep(20); //set time interval.

}

return 0;

}

1. Does the code below work as well? Please explain the effect of { } in the if clause.

if (KEY_DOWN(VK_MBUTTON))

printf("Middle click to clean the screen. Pause 1 second.");

Sleep(1000);//pause 1 second

system("cls");//Clean the screen

2. How the function Sleep(1000) works?
3. Please try to design a new feature and modify the code. Show your code below.