Interface 4 push button with arduino & do following: ** SW1 : when press, display 0 to 9 on LCD ** SW2 : when press, display 00 to 99 on LCD ** SW3 : when press, display 000 to 999 on LCD ** SW4 : when press, display 0000 to 9999 on LCD

Here i am using online IDE Tinkercad . If you don't know what is tinkercad then refer my blog HERE or else you can use offline IDE also.

Code :-

#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

int buttonState1 = 0;

  int buttonState2 = 0;

  int buttonState3 = 0;

  int buttonState4 = 0;

void setup() {

  lcd.begin(16, 2);

  pinMode(6, INPUT);

  pinMode(7, INPUT);

  pinMode(8, INPUT);

  pinMode(9, INPUT);

  Serial.begin(9600);

}

void loop() { 

  if(digitalRead(6)== HIGH){

  for(int i = 0 ; i<=9 ; i++)

  {lcd.setCursor(0,0);

    lcd.print(i);

   delay(500);

  }

  }

 if(digitalRead(7)== HIGH){

  for(int i = 00 ; i<=99 ; i++)

  {lcd.setCursor(0,0);

    lcd.print(i);

   delay(500);

  }

  }  

  if(digitalRead(8)== HIGH){

  for(int i = 000 ; i<=999 ; i++)

  {lcd.setCursor(0,0);

    lcd.print(i);

   delay(500);

  }

  } 

  if(digitalRead(9)== HIGH){

  for(int i = 0000 ; i<=9999 ; i++)

  {lcd.setCursor(0,0);

    lcd.print(i);

   delay(500);

  }

  }

}

Output :-