Running non-existent code.

I am new to the arduino and have bought myself the maker kit as well as a gyro model L3G4200D. I have an LCD attached and have read the values from it. I deleted the print code completely from the code and my LCD still shows the output values. I used lcd.print(x); to print my x value and it worked. I cannot think of how it could possibly do something that isn’t there. Could someone please tell me why it would do something so weird?

//Arduino 1.0+ only

#include <Wire.h>
#include <Servo.h>
#include <LiquidCrystal.h>

#define CTRL_REG1 0x20
#define CTRL_REG2 0x21
#define CTRL_REG3 0x22
#define CTRL_REG4 0x23
#define CTRL_REG5 0x24

Servo myservo;
int potpin = 0;
int val;

int L3G4200D_Address = 105; //I2C address of the L3G4200D

int x;
int y;
int z;

LiquidCrystal lcd(7, 8, 9, 10, 11, 12);

void setup(){

lcd.begin(16, 2);
myservo.attach(0);
Wire.begin();
Serial.begin(9600);

//lcd.println(“starting up L3G4200D”);
setupL3G4200D(2000); // Configure L3G4200 - 250, 500 or 2000 deg/sec

delay(1500); //wait for the sensor to be ready

delay(1500);
lcd.clear();
}

void loop(){

getGyroValues(); // This will update x, y, and z with new values
int alex;

Serial.print(" Y:");
Serial.print(y);

Serial.print(" Z:");
Serial.println(z);
digitalWrite(0, HIGH);
pinMode(2, INPUT);
if (digitalRead(2) == HIGH){
myservo.detach();
alex = 100000;
val = 0;
}
val = x -12; // reads the value of the potentiometer (value between 0 and 1023)
//digitalWrite(10, HIGH);
val = map(val, 0, 1023, 0, 179); // scale it to use it with the servo (value between 0 and 180)
myservo.write(val); // sets the servo position according to the scaled value

delay(100); //Just here to slow down the serial to make it more readable
}

void getGyroValues(){

byte xMSB = readRegister(L3G4200D_Address, 0x29);
byte xLSB = readRegister(L3G4200D_Address, 0x28);
x = ((xMSB << 8) | xLSB);

byte yMSB = readRegister(L3G4200D_Address, 0x2B);
byte yLSB = readRegister(L3G4200D_Address, 0x2A);
y = ((yMSB << 8) | yLSB);

byte zMSB = readRegister(L3G4200D_Address, 0x2D);
byte zLSB = readRegister(L3G4200D_Address, 0x2C);
z = ((zMSB << 8) | zLSB);
}

int setupL3G4200D(int scale){
//From Jim Lindblom of Sparkfun’s code

// Enable x, y, z and turn off power down:
writeRegister(L3G4200D_Address, CTRL_REG1, 0b00001111);

// If you’d like to adjust/use the HPF, you can edit the line below to configure CTRL_REG2:
writeRegister(L3G4200D_Address, CTRL_REG2, 0b00000000);

// Configure CTRL_REG3 to generate data ready interrupt on INT2
// No interrupts used on INT1, if you’d like to configure INT1
// or INT2 otherwise, consult the datasheet:
writeRegister(L3G4200D_Address, CTRL_REG3, 0b00001000);

// CTRL_REG4 controls the full-scale range, among other things:

if(scale == 250){
writeRegister(L3G4200D_Address, CTRL_REG4, 0b00000000);
}else if(scale == 500){
writeRegister(L3G4200D_Address, CTRL_REG4, 0b00010000);
}else{
writeRegister(L3G4200D_Address, CTRL_REG4, 0b00110000);
}

// CTRL_REG5 controls high-pass filtering of outputs, use it
// if you’d like:
writeRegister(L3G4200D_Address, CTRL_REG5, 0b00000000);
}

void writeRegister(int deviceAddress, byte address, byte val) {
Wire.beginTransmission(deviceAddress); // start transmission to device
Wire.write(address); // send register address
Wire.write(val); // send value to write
Wire.endTransmission(); // end transmission
}

int readRegister(int deviceAddress, byte address){

int v;
Wire.beginTransmission(deviceAddress);
Wire.write(address); // register to read
Wire.endTransmission();

Wire.requestFrom(deviceAddress, 1); // read a byte

while(!Wire.available()) {
// waiting
}

v = Wire.read();
return v;
}

Moderator edit: Smileys removed using “Additional options - Don’t use smileys.”

I don’t understand this stuff:

 x = ((xMSB << smiley-cool | xLSB);

  byte yMSB = readRegister(L3G4200D_Address, 0x2B);
  byte yLSB = readRegister(L3G4200D_Address, 0x2A);
  y = ((yMSB << smiley-cool | yLSB);

  byte zMSB = readRegister(L3G4200D_Address, 0x2D);
  byte zLSB = readRegister(L3G4200D_Address, 0x2C);
  z = ((zMSB << smiley-cool | zLSB);

Can you please edit your post, and replace the posted code with code in [ code ] tags (use the “#” button above the posting box) rather than the “feature” Copy For Forum?

My tentative guess is that your changed version didn't upload correctly, and you are still running the older version, if it is running code you deleted.

You were right with that! I had an error of it being out of sync. Unplugging the shield and downloading fixed it. Thanks! And the smileys were 8).