Comparing two ds20b18 values

Hello forum users! I am very new to home automation and I am currently working on my first project. ofcourse any of you will know that it will not go as hoped before XD. I have my code up and running but now I use a set value to compare my sensors against. What i want to achieve now is comparing two sensor values, and with that comparison i want to switch a relay either on or off.
I have tried to get it working but I am stuck, is someone able to help me?

Thanks in advance!

//hereby the code
#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged TO GPIO 4
#define ONE_WIRE_BUS 4

// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);

// Number of temperature devices found
int numberOfDevices;
const int relay = 26;

// We'll use this variable to store a found device address
DeviceAddress tempDeviceAddress;

void setup(){
// start serial port
Serial.begin(115200);
pinMode(relay, OUTPUT);
// Start up the library
sensors.begin();

// Grab a count of devices on the wire
numberOfDevices = sensors.getDeviceCount();

// locate devices on the bus
Serial.print("Locating devices...");
Serial.print("Found ");
Serial.print(numberOfDevices, DEC);
Serial.println(" devices.");

// Loop through each device, print out address
for(int i=0;i<numberOfDevices; i++){
// Search the wire for address
if(sensors.getAddress(tempDeviceAddress, i)){
Serial.print("Found device ");
Serial.print(i, DEC);
Serial.print(" with address: ");
printAddress(tempDeviceAddress);
Serial.println();
} else {
Serial.print("Found ghost device at ");
Serial.print(i, DEC);
Serial.print(" but could not detect address. Check power and cabling");
}
}
}

void loop(){
sensors.requestTemperatures(); // Send the command to get temperatures
//int arrayOne[2]={ sensors.getTempC(tempDeviceAddress), sensors.getTempC(tempDeviceAddress)};
//werkt nog niet
// Loop through each device, print out temperature data
for(int i=0;i<numberOfDevices; i++){
// Search the wire for address
if(sensors.getAddress(tempDeviceAddress, i)){
// Output the device ID
Serial.print("Temperature for device: ");
Serial.println(i,DEC);
// Print the data
float tempC = sensors.getTempC(tempDeviceAddress);
Serial.print("Temp C: ");
Serial.println(tempC);

 if( sensors.getTempC(tempDeviceAddress) > 24)

{
digitalWrite(relay, LOW);
Serial.println("Current Flowing");
}
if( sensors.getTempC(tempDeviceAddress) < 24)
{
digitalWrite(relay, HIGH);
Serial.println("Current not Flowing");
}
}

}
delay(5000);
}

// function to print a device address
void printAddress(DeviceAddress deviceAddress) {
for (uint8_t i = 0; i < 8; i++){
if (deviceAddress[i] < 16) Serial.print("0");
Serial.print(deviceAddress[i], HEX);
}
}Vooraf opgemaakte tekst

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