int state = 0;         Variable to hold the current state.
int pressed;           Indicates which button was pressed.

int Photosensor = 0;         IO pin number for first button.
int Snapbutton = 2;         IO pin number for second button.
int Pushbutton = 4;         IO pin number for third button.

int potval1;     Holds the value of the first button.
int potval2;     Holds the value of the second button.
int potval3;     Holds the value of the third button.

int testLEDPin = 13;

void setup() {
  pinMode(testLEDPin, OUTPUT);
  pinMode(Photosensor, INPUT);
    pinMode(Photosensor, HIGH);
  pinMode(Snapbutton, INPUT);       Setup these pins as INPUT signals.
    pinMode(Snapbutton, LOW)
  pinMode(Pushbutton, INPUT);
    pinMode(Pushbutton, LOW);
  
  Serial.begin(9600);
}

void loop() {
  pressed = getButton();       Calls the method that determines which button was pressed.
  updateState();               Calls the method that changes the state based on the input.
}


  getButton() method waits for a button to be pressed,
  determines which button was pressed and then returns
  the button number to the main loop.
 
int getButton() {
  val1 = LOW;
  val2 = LOW;                  Initialize all button values to LOW. 
  val3 = LOW;
  
   This while loop waits for a button to be pressed.
  while ((val1  val2  val3)==LOW) {   Conditions is that all three vals must be LOW.
                                    As soon as one of them is HIGH, the program exits the loop.
                                    BTW HIGH is the same as TRUE; LOW is the same as FALSE.
    Serial.print(^ );             Print a ^  while waiting for a button to be pressed (button is ^ up).
    val1 = digitalRead(b1);
    val2 = digitalRead(b2);         Get the values of the buttons.
    val3 = digitalRead(b3);
  }
  
   These if conditions determine which button was pressed to come out of the while wait bit above.
  if (val1 == HIGH) pressed = b1;
  if (val2 == HIGH) pressed = b2;
  if (val3 == HIGH) pressed = b3;
  
  Serial.print(pressed );
  Serial.print(pressed);
  digitalWrite(testLEDPin, HIGH);
  
   This while loop waits to be sure that the button was released.
  while (digitalRead(pressed)==HIGH) {   Condition is that digitalRead(pressed) is TRUE.
    Serial.print(_ );            Print a _  while button is still pressed.
  }
  
  digitalWrite(testLEDPin, LOW);  
  return pressed;
}

void updateState() {
  
}