determine which mouse button is clicked

#include<graphics.h>
#include<conio.h>
#include<dos.h>
 
union REGS i, o;
 
int initmouse()
{
   i.x.ax = 0;
   int86(0X33,&i,&o);
   return ( o.x.ax );
}
 
void showmouseptr()
{
   i.x.ax = 1;
   int86(0X33,&i,&o);
}
 
void getmousepos(int *button, int *x, int *y)
{
   i.x.ax = 3;
   int86(0X33,&i,&o);
 
   *button = o.x.bx;
   *x = o.x.cx;
   *y = o.x.dx;
}
 
main()
{
   int gd = DETECT, gm, status, button, x, y;
   char array[50];
 
   initgraph(&gd,&gm,"C:\\TC\\BGI");
   settextstyle(DEFAULT_FONT,0,2);
 
   status = initmouse();
 
   if ( status == 0 )
      printf("Mouse support not available.\n");
   else
   {
      showmouseptr();
 
      getmousepos(&button,&x,&y);
 
      while(!kbhit())
      {
         getmousepos(&button,&x,&y);
 
         if( button == 1 )
         {
            button = -1;
            cleardevice();
            sprintf(array,"Left Button clicked x = %d y = %d",x,y);
            outtext(array);
         }
         else if( button == 2 )
         {
            button = -1;
            cleardevice();
            sprintf(array,"Right Button clicked x = %d y = %d",x,y);
            outtext(array);
         }
 
      }
   }
 
   getch();
   return 0;
}