check if mouse support is available or not

#include<dos.h>
#include<conio.h>
 
int initmouse();
 
union REGS i, o;
 
main()
{
   int status;
 
   status = initmouse();
 
   if ( status == 0 )
      printf("Mouse support not available.\n");
   else
      printf("Mouse support available.\n");
 
   getch();
   return 0;
}
 
int initmouse()
{
   i.x.ax = 0;
   int86(0X33,&amp;i,&amp;o);
   return ( o.x.ax );
}