DEV c++ , program error after compilation

[mistarbinay]

First time ,after I compile and run my program it gave me an error that it
didn't found dbgeng.dll file. Now I have a fresh instal of windows Xp, after
compilation it still gives me an error but it's not specific.
In my code I have those lines :
int Dx = abs( x2 - x1);
int Dy = abs( y2 - y1);
int S = Dy / Dx ;

If i remove the third line , the program works, with the third line ,it
crashes.
I can't understand why it doesn't work.In my program I'm using winAPI and
openGL is somehow related to those?

[Anonymous]