#include <LiquidCrystal_I2C.h>
#include <Keypad.h>

LiquidCrystal_I2C lcd(0x27,16,2);

byte rowpins[4] = {2,3,4,5}; 
byte colpins[4] = {6,7,8,9};

char keys[4][4] = {

{'1','2','3','+'},
{'4','5','6','-'},
{'7','8','9','.'},
{'*','0','#','/'}
};






Keypad sasu = Keypad(makeKeymap(keys),rowpins,colpins,4,4);



void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
lcd.begin(16,2);}

void loop() {
  // put your main code here, to run repeatedly:
char key = sasu.getKey();

if(key != NO_KEY){
 lcd.backlight();
lcd.setCursor(0,5);
lcd.println(key);

}

}