Arduino Nano Logic Probe

//Arduino Nano Logic Probe
//3-Digit Common Cathode Display
int A=2;
int B=3;
int C=4;
int D=5;
int E=6;
int F=7;
int d1=8;
int d2=9;
int d3=10;
int switchPin=12;
int d=85;
void setup(){
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);
pinMode(8, OUTPUT);
pinMode(9, OUTPUT);
pinMode(10, OUTPUT);
pinMode(12, INPUT);
}
void loop(){
int val = digitalRead(12);
if(val == LOW){
//0
digitalWrite(A, HIGH);
digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, HIGH);
digitalWrite(E, HIGH);
digitalWrite(F, HIGH);
digitalWrite(d1, LOW);
digitalWrite(d2, HIGH);
digitalWrite(d3, HIGH);
delay(d);
//0
digitalWrite(A, HIGH);
digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, HIGH);
digitalWrite(E, HIGH);
digitalWrite(F, HIGH);
digitalWrite(d1, HIGH);
digitalWrite(d2, LOW);
digitalWrite(d3, HIGH);
delay(d);
//0
digitalWrite(A, HIGH);
digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, HIGH);
digitalWrite(E, HIGH);
digitalWrite(F, HIGH);
digitalWrite(d1, HIGH);
digitalWrite(d2, HIGH);
digitalWrite(d3, LOW);
delay(d);
 }
if(val== HIGH){
//1
digitalWrite(A, LOW);
digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, LOW);
digitalWrite(E, LOW);
digitalWrite(F, LOW);
digitalWrite(d1, LOW);
digitalWrite(d2, HIGH);
digitalWrite(d3, HIGH);
delay(d);
//1
digitalWrite(A, LOW);
digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, LOW);
digitalWrite(E, LOW);
digitalWrite(F, LOW);
digitalWrite(d1, HIGH);
digitalWrite(d2, LOW);
digitalWrite(d3, HIGH);
delay(d);
//1
digitalWrite(A, LOW);
digitalWrite(B, HIGH);
digitalWrite(C, HIGH);
digitalWrite(D, LOW);
digitalWrite(E, LOW);
digitalWrite(F, LOW);
digitalWrite(d1, HIGH);
digitalWrite(d2, HIGH);
digitalWrite(d3, LOW);
delay(d);
}
}