temperature display on led

int ledpin=7;
int hornpin=8;
int buttonpin=3;
int a;
int del=1000;
float temperature;
int B=3975;
float resistance;
#include <Wire.h>
#include "rgb_lcd.h"

rgb_lcd lcd;

const int colorR = 255;
const int colorG = 255;
const int colorB = 255;


void setup() {
pinMode(buttonpin,INPUT);
pinMode(ledpin,OUTPUT);
pinMode(hornpin,OUTPUT);
Serial.begin(9600);
 lcd.begin(16, 2);
   
    lcd.setRGB(colorR, colorG, colorB);
    
   
   

    delay(1000);


}

void loop() {
 int buttonpinstate=digitalRead(buttonpin); 

 if(buttonpinstate==1)
 {
 digitalWrite(ledpin,HIGH);
 a=analogRead(A0);
  resistance=(float)(1023-a)*10000/a;
  temperature=1/(log(resistance/10000)/B+1/298.15)-273.15;
  lcd.print("Temperature:");
  lcd.print(temperature);
  delay(del);
 
 if(temperature<16)
 {
  digitalWrite(ledpin,HIGH);
  delay(500);
  digitalWrite(ledpin,LOW);
  
 }
 }
 else
 

  digitalWrite(ledpin,LOW);
      lcd.setCursor(0, 1);

   delay(100);
}