LCD shield

#include <LiquidCrystal.h>
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
void setup() 
{
 // set up the LCD's number of rows and columns:
 lcd.begin(16, 2);
 // Print a message to the LCD.
 lcd.print("Hello, world!");
}
void loop() 
{
 // set the cursor to column 0, line 1
// (note: line 1 is the second row, since counting begins with 0):
 lcd.setCursor(0, 1);
 // All the shield buttons (except reset) are connected to pin A0
 // through a resistor network so that different analog values
 // are produced by each button.
 int a0 = analogRead(0);
 if (a0 >= 800) 
{
   lcd.print("      ");
 }
 else if (a0 < 800 && a0 >= 600)
 {
 lcd.print("Select");
}
 else if (a0 < 600 && a0 >= 400) 
{
   lcd.print("Left  ");
 }
   else if (a0 < 400 && a0 >= 200)
 {
  lcd.print("Down  ");
 }
   else if (a0 <     200 && a0 >= 100)
 {
 lcd.print("Up    ");
 }
 else 
{
   lcd.print("Right ");
 }
}