/*
  Forum:https://forum.arduino.cc/t/solved-if-statement-running-regardless-of-whether-condition-is-met/1216652/37
  Wokwi: https://wokwi.com/projects/388097069591716865

*/

// include the library code:
#include <LiquidCrystal.h>
const byte buttonPin = 12;
int buttonState = 0;   // variable for reading the pushbutton status
int randNumber;        // the variable which is supposed to hold the random number

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(6, 7, 8, 9, 10, 11); /// REGISTER SELECT PIN,ENABLE PIN,D4 PIN,D5 PIN, D6 PIN, D7 PIN


void setup()
{
  // initialize the serial port, 115200 is usually the state-of-the-art baudrate
  Serial.begin(115200);
  // initialize the pushbutton pin as an input; this requires to
  // connect it to HIGH level and the buttonPin connection to GND via a resistor
  // ... usually using INPUT_PULLUP is easier to realize ...
  pinMode(buttonPin, INPUT);
  // initialize the pseudo-random number generator
  randomSeed(analogRead(0));
  // set up the LCD’s number of columns and rows:
  lcd.begin(16, 2);
}


void loop()
{
  // Set randNumber to Zero; if the button is pressed randNumber will
  // get a value between 1 and 3 anyway
  // So we can check later if randNumber is greater than zero
  // to take action, if randNumber is zero we do nothing!
  randNumber = 0;
  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  buttonState = digitalRead(buttonPin);
  if (buttonState == HIGH) {
    // turn LED on:
    randNumber = random(1, 4);   // generate a random number
    Serial.println(randNumber);
    lcd.setCursor(15, 0); // set the cursor to column 0, line 2
    lcd.print(randNumber);
    delay(20);//delay of 0.02sec to "debounce" the button
  }
  // switch evaluates the value of randNumber is uses the according case 
  // "break;" at the end of each case avoids that the program runs into the
  // next case 
  switch (randNumber) {
    case 0 :
      // We do nothing!!!
      break;
    case 1:
         Serial.println("Do the stuff here for 1");
         delay(1000); // Give some time to release the button!
         // Reset randNumber so that nothing happens in the next loop()! 
         randNumber = 0;
      break;
    case 2:
         Serial.println("Do the stuff here for 2");
         delay(1000); // Give some time to release the button!
         // Reset randNumber so that nothing happens in the next loop()! 
         randNumber = 0;
      break;
    case 3:
         Serial.println("Do the stuff here for 3");
         delay(1000); // Give some time to release the button!
         // Reset randNumber so that nothing happens in the next loop()! 
         randNumber = 0;
      break;
  }
}