4 push buttons

Projects Programming
7 
byte button[] = {30, 26, 28, 32};
byte numberOfButtons = 4;
byte buttonState[numberOfButtons];  
byte activeButton[numberOfButtons];
boolean hit;

void setup() 
{
  for (byte i = 0; i < numberOfButtons; i++) 
  {
    pinMode(button[i], INPUT_PULLUP);  //Check for LOW for a button press
  }   
  Serial.begin(115200); 
}

void loop() 
{
  for (byte i = 0; i < numberOfButtons; i++) //read all buttons at beginning of loop()
  {  
    buttonState[i] = !digitalRead(button[i]);
  }
  
  for (byte i = 0; i < numberOfButtons; i++)
  {
    if (buttonState[i] && (!otherButtonPressed(i) || activeButton[i]))  //if no other buttons are active or this one is already active
    {
      activeButton[i] = true;
      Serial.print(i+1);
    }
    else
    {
      activeButton[i] = false;
    }
  }
}

boolean otherButtonPressed(byte currentButton)
{
  hit = 0;
  for (byte i = 0; i < numberOfButtons; i++)
  {
    if (i == currentButton)
    {
      continue; // skip test for button passed to function
    }
    if (activeButton[i] == HIGH)  // if any other button is currently the active one
    {
      hit = true;
    }
  }
  return hit;  //Were any other buttons already pressed?
}