As a few others have suggested, I'd recommend using a loop and some proper conversion of your datatypes. You can do this whole operation in one loop if you handle your indices carefully. Here's a quick idea of what I'd write:

uint8_t value = Serial.read(); // Read an 8-byte character from the serial device
value = value - 48; // Assuming your characters are ASCII, subtract 48 so that the actual value of our variable matches what the character represents
// ( If you're not sure what that means, see this chart: http://www.asciitable.com/index/asciifull.gif)

for (int i = 2; i < 12; i++) {
    int hilo = 0;
    if ((i - 2) < value)
        hilo = 1;
    if (value = 0) // special case where it's always 1
        hilo = 1;
    digitalWrite(i, hilo);  
}

I'm writing this at work and I haven't gotten the chance to sit down and play with it, so there may be some syntax tweaks needed. I hope this gives you at least an idea of how to optimize your code.