void clockwise();
void anticlockwise();
void blink();
const int led[3]={12,4,2};
void setup(){
  for(int i=0;i<3;i++){
  pinMode(led[i], OUTPUT);
  }}
void loop(){
  int Caseselection=4;
  switch(Caseselection){
  case 1:
    clockwise();
  break;
  case 2:
    anticlockwise();
  break;
  case 3:
    blink();
  break;
  case 4:
    clockwise();
    anticlockwise();
    blink();
  default:
  break;}}
    void clockwise(){
    for(int i=0;i<3;i++){
    digitalWrite(led[i], HIGH);
    delay(500);
    digitalWrite(led[i], LOW);
    delay(500);}}
    void anticlockwise(){
    for(int i=2;i>=0;i--){
    digitalWrite(led[i], HIGH);
    delay(500);
    digitalWrite(led[i], LOW);
    delay(500);}}
    void blink(){
    for(int j=0;j<3;j++){
    for(int i=0;i<3;i++){
    digitalWrite(led[i], HIGH);}
    delay(500);
    for(int i=2;i>=0;i--){
    digitalWrite(led[i], LOW);}
    delay(500);}}