Problems getting decimal points from average readings

hey guys. im new of , have hit road block. before made heater controller aquarium using uno, ds18b20, , relays. works been while , want make better version.
ive started on new version, time using 2 ds18b20, averaging temps between 2 , using number turn aquarium heaters on , off. know code horrible way accomplish seems kind of working. problem need average temp reading 2 decimal points 2 ds18b20 reading.
temp1: xx.xx f
temp2: xx.xx f
average: xx f

can offer advice?
this have far

code: [select]


#include <liquidcrystal.h>
#include <onewire.h>
#include <dallastemperature.h>
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
liquidcrystal lcd(rs, en, d4, d5, d6, d7);
#define one_wire_bus 6
#define two_wire_bus 7
onewire onewire(one_wire_bus);
onewire twowire(two_wire_bus);
dallastemperature sensor1(&onewire);
dallastemperature sensor2(&twowire);

void setup()
{
  lcd.begin(20, 4);
  sensor1.begin();
  sensor2.begin();

  //temp1
  lcd.setcursor (0, 0);
  lcd.print ("temp 1:");
  lcd.setcursor (14, 0);
  lcd.print ("f");

  //temp2
  lcd.setcursor (0, 1);
  lcd.print ("temp 2:");
  lcd.setcursor (14, 1);
  lcd.print ("f");

  //average
  lcd.setcursor (0, 2);
  lcd.print ("average:");
  lcd.setcursor (14, 2);
  lcd.print ("f");

}

void loop()
{
  sensor1.requesttemperatures();
  sensor2.requesttemperatures();

  //average temp reading
  int = sensor1.gettempfbyindex(0);
  int b = sensor2.gettempfbyindex(0);
  int c = 2;
  int sum = + b;
  int average = sum / c;

  //temp1 reading
  lcd.setcursor(9, 0);
  lcd.print(sensor1.gettempfbyindex(0));

  //temp2 reading
  lcd.setcursor(9, 1);
  lcd.print(sensor2.gettempfbyindex(0));

  //average of 2 readings
  lcd.setcursor (9, 2);
  lcd.print (average);

  delay(500);
}


quote

int average = sum / c;

you've declared average integer. integers don't have fractional parts.

pete

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