accessing the window key in c

#include <stdio.h>
#include <bios.h>
#include <ctype.h>
int main(void)
{
   int key;
    clrscr();
   key = bioskey(0);
   printf("%x",key);
   if(key==0x4d00)
     printf("right");
   if(key==0x4b00)
     printf("left");
   if(key==0x4800)
     printf("up");
   if(key==0x5000)
     printf("down");
   getch();
}