baoqi’s arduino homework3

  
const int buttonPin=2;

int flag = 1;

void setup() {
  Serial.begin(9600);
  for (int thisPin = 7; thisPin < 11; thisPin++) {
    pinMode(thisPin, OUTPUT);
  }
  pinMode(buttonPin,INPUT);
}

void loop() {

  if(digitalRead(buttonPin)==LOW){
    flag = -flag;
  }

  if(flag==1){
    Serial.println("Looping for 4 LED's");
    for (int thisPin =7; thisPin <  11; thisPin++) {
    // turn the pin on:
    digitalWrite(thisPin, HIGH);
    delay(200);
    // turn the pin off:
    digitalWrite(thisPin, LOW);
  }
  }else{
    Serial.println("Looping for 3 LED's");
    for (int thisPin =8; thisPin <  11; thisPin++) {
    // turn the pin on:
    digitalWrite(thisPin, HIGH);
    delay(200);
    // turn the pin off:
    digitalWrite(thisPin, LOW);
  }
  }

  
}