Need guides in understanding the codes

[Jeremy07]

Hi guys, can someone explain me on what does these codes did? this is only part of the code...

 // Create the window of the application
  sf::RenderWindow myWindow(sf::VideoMode(myWorldWidth, myWorldHeight, 32), "Battleship!");
  myWindow.setVerticalSyncEnabled(true);
  
  bool showHardwareMouse;
  bool started;
  bool drag;
  float dragOffsetX, dragOffsetY;
  bool LeftMouseButtonDown = false;
  bool reset = true;

  
  //----- Main Loop Start here -----
  while (myWindow.isOpen())
  {
    if (reset)
    {
      // Reset
      showHardwareMouse = true;
      drag = false;
      dragOffsetX = dragOffsetY = 0.0f;
      started = true;
      reset = false;
    }

the program is actually based on SFML library, what does dragOffsetX = dragOffsetY = 0.0f; means?

and this is how actually the program work like...
http://i1146.photobucket.com/albums/o530/HTHVampire/C%20plus%20plus/Capture2_zps1fe188cd.jpg

I will post the full codes of it if you guys can't get it. Thanks!

[keskiverto]

The meaning of:

float dragOffsetX, dragOffsetY;
dragOffsetX = dragOffsetY = 0.0f;

is that first a float value 0.0 is assigned to float variable named dragOffsetY,
and since the return value of that expression is 0.0,
a float value 0.0 is assigned to float variable named dragOffsetX.

The logical meaning of those assignments depends on the rest of the code.