Analog Input (LDR) with Digital Output (7 Segment Display) (Task 27)

Addition to the program we wrote that read a value of an LDR and the output it to serial. This program takes that reading, divides it by 10 then outputs the value onto a 7 segment display. The board layout is that same as in the post titled "Combining Some New Concepts" :

int reading;
void setup() {
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(11, OUTPUT);
pinMode(10, OUTPUT);
pinMode(9, OUTPUT);
pinMode(8, OUTPUT);
pinMode(7, OUTPUT);
Serial.begin(9600);
}

void loop() {
reading = analogRead(0);
reading = reading/100;
digitalWrite(13,0);
digitalWrite(12,0);
digitalWrite(11,0);
digitalWrite(10,0);
digitalWrite(9,0);
digitalWrite(8,0);
digitalWrite(7,0); //resets all LEDs on segment
Serial.println(reading); //output value to serial for debugging and checking values
switch (reading) {
case 1:{
digitalWrite(10,1);
digitalWrite(7,1);}
break;
case 2:{
digitalWrite(13,1);
digitalWrite(11,1);
digitalWrite(10,1);
digitalWrite(9,1);
digitalWrite(8,1);}
break;
case 3:{
digitalWrite(13,1);
digitalWrite(11,1);
digitalWrite(10,1);
digitalWrite(8,1);
digitalWrite(7,1);}
break;
case 4:{
digitalWrite(13,1);
digitalWrite(12,1);
digitalWrite(10,1);
digitalWrite(7,1);}
break;
case 5:{
digitalWrite(13,1);
digitalWrite(12,1);
digitalWrite(11,1);
digitalWrite(8,1);
digitalWrite(7,1);}
break;
case 6:{
digitalWrite(13,1);
digitalWrite(12,1);
digitalWrite(11,1);
digitalWrite(9,1);
digitalWrite(8,1);
digitalWrite(7,1);}
break;
case 7:{
digitalWrite(11,1);
digitalWrite(10,1);
digitalWrite(7,1);}
break;
case 8:{
digitalWrite(13,1);
digitalWrite(12,1);
digitalWrite(11,1);
digitalWrite(10,1);
digitalWrite(9,1);
digitalWrite(8,1);
digitalWrite(7,1);}
break;
case 9:{
digitalWrite(13,1);
digitalWrite(12,1);
digitalWrite(11,1);
digitalWrite(10,1);
digitalWrite(8,1);
digitalWrite(7,1);}
break;
case 0:{
digitalWrite(12,1);
digitalWrite(11,1);
digitalWrite(10,1);
digitalWrite(9,1);
digitalWrite(8,1);
digitalWrite(7,1);} // if a value is above 999 or below 99 then the display will show 0
}
delay(500);
}