C PROGRAM TO CONTROL HARDWARE PART-1

THIS IS A SMALL C PROGRAM DEVELOPED BY ME TO CONTROL A HARWARE OR ROBOT
WITH THE PARALLEL PORT OF THE COMPUTER.
PROGRAM
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#include iostream.h
#include conio.h
#include dos.h
void main()
{
int sd,key;
clrscr();
sd=0;
while(1)
{
if(kbhit())
key=getch();
if(key==56)
{ sd=sd|1;
sd=sd&253;
}
if(key==50)
{
sd=sd|2;
sd=sd&254;
}
if(key==54)
{
sd=sd|4;
sd=sd&247;
}
if(key==52)
{
sd=sd|8;
sd=sd&251;
}
if(key==115)
{
sd=sd&254;
sd=sd&253;
sd=sd&251;
sd=sd&247;
}
if(key==100)
{
sd=sd&251;
sd=sd&247;
}

if(key==27)
{ outportb(0x3BC,0);
delay(2000);
cout<<"delay over"; break; } outportb(0x3BC,sd);
}
}
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FURTHER DETAILS FOR USING THIS PROGRAM WILL BE GIVEN SOON.