Hardware program to inverse the status of caps, num and scroll lock

This is a hardware program to inverse the status of the caps, num and scroll lock. If you have any doubts please let me know.

#include<stdio.h>

#include<conio.h>

#include<dos.h>

#include<graphics.h>

int main()

{

int c,n,s;

int far *p=(int far *)0x417;

int far *q=(int far *)0x418;

char text[50];

union REGS in, out;

clrscr();

c=*p&0x40;

s=*p&0x10;

n=*p&0x20;

if (c==0x40)

                        printf("\nCaps lock is ON");

else

                        printf("\nCaps lock is OFF");

if(n==0x20)

                        printf("\nNum lock is OFF");

else

                        printf("\nNum lock is ON");

if(s==0x10)

                        printf("\nScroll lock is ON");

else

                        printf("\nScroll lock is OFF");

printf("\nText before toggle: ");

gets(text);

*p=*p^0x70;

*q=*q^0x70;

printf("\nTOGGLE\n");

c=*p&0x40;

s=*p&0x10;

n=*p&0x20;

if (c==0x40)

                        printf("\nCaps lock is ON");

else

                        printf("\nCaps lock is OFF");

if(n==0x20)

                        printf("\nNum lock is OFF");

else

                        printf("\nNum lock is ON");

if(s==0x10)

                        printf("\nScroll lock is ON");

else

                        printf("\nScroll lock is OFF");

printf("\nText after toggle: ");

gets(text);

printf("\n Press any key to exit");

getch();

return 0;

}