DIGITAL TOSSER (Using Arduino UNO)

#include <LiquidCrystal.h>
int contrast=75;//Set LCD contrast
const int buttonpin=8;
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  analogWrite(9, contrast);
  lcd.begin(16, 2);
  pinMode(buttonpin,INPUT);//Button pin as input
  lcd.setCursor(0,0);//Set cursor to column 0, line 0
  lcd.print("Lets start toss");
  delay(1000); 
}

void loop() {
  
int  buttonState=digitalRead(buttonpin);
  int r=random(1,3);//Random nuber generation between 1-3
  lcd.setCursor(0,0);// set the cursor to column 0, line 0
  lcd.print("For H press Key");//For Heads press key
  lcd.setCursor(0,1);
  lcd.print("Dont press for L");//For Tails don't press key
  delay(3000);
  lcd.clear();
  
  lcd.setCursor(0,1);
  if ((buttonState==HIGH)&&(r==1))//Button High and random number=1
  lcd.print("Heads,You won");
  else if((buttonState==LOW)&&(r==2))//Button Low and random number =2
  lcd.print("Tails,You won");
  else
  lcd.print("You lost");//Can be button High ,random number=2 or LOw and r=1
  delay(10000); 
  lcd.clear();
}