How to make LED light using parallel port

#include<stdio.h>
#include<ioports.h>

/* NOTE:
Don't forget to add the -l ioports option under Tools->Compiler options
This will add the ioport interface library

OR 

from the command line:
        
        gcc binary.c -l ioports -o binary.exe
*/


/* Define which port to write to */
#define IO_PORT 0x378

main(void)
{
   int num;
   char instr[25];
   
   printf("press ctrl-C to stop\n\n");
   
   /* Place port into standard output mode */
   outb(IO_PORT+2, inb(IO_PORT+2) & ~32);
   
   while (1) {

      printf("Enter a number (prefix with 0x for hex) :");
      fgets(instr, sizeof(instr), stdin);
      
      /* Jump out of loop if q entered */
      if (toupper(instr[0]) == 'Q')
         break;
         
      sscanf(instr, "%i", &num);
      
      /* now output it to the port */
      outb(IO_PORT, num);  /* write value to port */
      
   }      
    
   return(0);     
}