please send me basic commands for accessing pc parallel port c coding on visual c++ ,

i typed following program but it compile correctly but doesnt access parallel port,

#include<stdio.h>
#include<conio.h>

#define portaddress 0x378

int main()
{
int a;
printf("Enter a number:");
scanf_s("%d",&a);
if(a<9)
{
_outp(portaddress,0x00);
}
else
{
_outp(portaddress,0x255);
}
system("pause");
return 0;
}
//i have winxp i have lpt1 driver,pinout32 userport almost all the thing,but still it doesnt work ,i have tried many different codes

 

In winxp enviroment ,you can not access directly to parallel port.
you need change to win98 or bootup dos from usb flash drive.
Or in winxp enviroment using free inout32.dll form logix4u.net
see the link http://logix4u.net/parallel-port/16-inpout32dll-for-windows-982000ntxp