This cpp program is used to blink led using computer parallel port

LedBlinkingParallelPort.c

#include <stdio.h>
#include <stdlib.h>
#include <asm/io.h>
#include <unistd.h>

#define base 0x378           /* printer port base address */
#define value 255            /* numeric value to send to printer port */

main()
{
	char a,b,g;
	if (ioperm(base,1,1))
	/*fprintf(stderr, "Couldn't get the port at %x\n", base), exit(1);*/
	printf("\n------------------------------------\n");

	outb(0, base);
	printf("enter the 1 for on ");
	scanf("%c",&a);

	if(a=='1')
	{
		usleep(2000000);
		outb(value,base);
	}
	
	//scanf("%c",&b);
	printf("\nenter the 0 for off:");
	scanf(" %c",&b);
	if(b=='0')
	{
		outb(0,base);
	}
	printf("enter the star for blinking:");
	scanf(" %c",&g);

	if(g=='*')
	{
		while(1)
		{
			outb(value,base),
			usleep(250000),
			outb(0,base),
			usleep(250000);
		}
	}
}

LedBlinkingParallelPort.cpp

#include <stdio.h>
#include <stdlib.h>
#include <iostream.h>
#include <conio.h>
#include <dos.h>

#define base 0x378           /* printer port base address */
#define value 255            /* numeric value to send to printer port */

main()
{
 char a,b,g;
 printf("\n------------------------------------\n");

 outp(base,0);

 printf("enter the 1 for on ");
  scanf("%c",&a);

 if(a=='1')
 {
  sleep(2000);
  outp(base,0);
 }

 printf("\nenter the 0 for off:");
 scanf(" %c",&b);
 if(b=='0')
 {
  outp(base,0);
 }

 printf("enter the star for blinking:");
 scanf(" %c",&g);
 if(g=='*')
 {
  while(1)
  {
   outp(base,0);
   sleep(2500),
   outp(base,1),
   sleep(2500);
  }
 }

}