Making ohm meter using Arduino and 16*2 LCD

1#include <Wire.h> 
2#include <LiquidCrystal_I2C.h>
3LiquidCrystal_I2C  lcd(0x27, 16, 2);
4int analogPin = A0;
5int raw = 0;
6int Vin = 5;
7float  Vout = 0;
8float R1 = 950; // value of 1k resistor
9float R2 = 0;
10float buffer  = 0;
11
12void setup(){
13    lcd.begin();
14    lcd.setCursor(0, 0);
15    lcd.print("Resistance  Meter");
16}
17
18void loop(){
19  raw = analogRead(analogPin);
20   if(raw==0){lcd.setCursor(0,  1);
21   
22    lcd.print("      Open      ");}
23  if(raw){
24    buffer  = raw * Vin;
25    Vout = (buffer)/1023.0;
26    buffer = (Vin/Vout) - 1;
27    R2 = R1 * buffer;
28    lcd.setCursor(3, 1);
29    if(R2>999.99){
30    lcd.print(R2/950);
31    lcd.print(" K Ohm  ");
32    }else{
33    lcd.setCursor(3, 1);
34    lcd.print(R2);
35    lcd.print(" Ohm   ");
36      }
37    delay(1000);
38  }
39}