Arduino Multi function shield - Read pot and display value on display

gistfile1.ino

/* Define shift register pins used for seven segment display */
#define LATCH_DIO 4
#define CLK_DIO 7
#define DATA_DIO 8

#define Pot1 0

/* Segment byte maps for numbers 0 to 9 */
const byte SEGMENT_MAP[] = {0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0X80,0X90};
/* Byte maps to select digit 1 to 4 */
const byte SEGMENT_SELECT[] = {0xF1,0xF2,0xF4,0xF8};

void setup ()
{
  Serial.begin(9600);
  /* Set DIO pins to outputs */
  pinMode(LATCH_DIO,OUTPUT);
  pinMode(CLK_DIO,OUTPUT);
  pinMode(DATA_DIO,OUTPUT);
}

/* Main program */
void loop()
{
  int PotValue;
  PotValue = analogRead(Pot1);
  Serial.print(“Potentiometer: “);
  Serial.println(PotValue);
  /* Update the display with the current counter value */
  WriteNumberToSegment(0 , PotValue / 1000);
  WriteNumberToSegment(1 , (PotValue / 100) % 10);
  WriteNumberToSegment(2 , (PotValue / 10) % 10);
  WriteNumberToSegment(3 , PotValue % 10);
}

/* Write a decimal number between 0 and 9 to one of the 4 digits of the display */
void WriteNumberToSegment(byte Segment, byte Value)
{
  digitalWrite(LATCH_DIO,LOW);
  shiftOut(DATA_DIO, CLK_DIO, MSBFIRST, SEGMENT_MAP[Value]);
  shiftOut(DATA_DIO, CLK_DIO, MSBFIRST, SEGMENT_SELECT[Segment] );
  digitalWrite(LATCH_DIO,HIGH);
}