C++ arduino code for the solar tracker

#include <Servo.h> // include Servo library

Servo horizontal; // horizontal servo
int servoh = 90; // stand horizontal servo SET SERVO POSITIONS VARIABLES TO MID-POINT
Servo vertical; // vertical servo
int servov = 90; // stand vertical servo

// LDR pin connections
// name = analogpin; defining LDR input pin names+attaching to physical pins
int ldrLT = 0; //LDR top left
int ldrRT = 1; //LDR top right
int ldrLD = 2; //LDR down left
int ldrRD = 3; //ldr down right

void setup()
{
  Serial.begin(9600);  //opens serial port, sets data rate to 9600 bits/s
// servo connections
// name.attach(pin);
  horizontal.attach(9); //attach physical digital pins to servos (PWM~ pins 9 and 10)
  vertical.attach(10);
}

void loop()
{
  int LeftTop = analogRead(ldrLT); // top left
  int RightTop = analogRead(ldrRT); // top right
  int LeftDown = analogRead(ldrLD); // down left
  int RightDown = analogRead(ldrRD); // down right

  int dtime = analogRead(4)/20; // read potentiometers - dtime is for how often to check difference
int tol = analogRead(5)/4; //read potentiometers - tol is tolerance for how far off the LDRs can be

int avt = (LeftTop + RightTop) / 2; // average value top
int avd = (LeftDown + RightDown) / 2; // average value down
int avl = (LeftTop + LeftDown) / 2; // average value left
int avr = (RightTop + RightDown) / 2; // average value right

int dvert = avt - avd; // check the difference of up and down
int dhoriz = avl - avr;// check the difference of left and right

if (-1*tol > dvert || dvert > tol) // check if the diffirence is within the tolerance else change vertical angle
{
if (avt > avd)
{
servov = ++servov;
if (servov > 180)
{
servov = 180;
}
}
else if (avt < avd)
{
servov= --servov;
if (servov < 0)
{
servov = 0;
}
}
vertical.write(servov);
}

if (-1*tol > dhoriz || dhoriz > tol) // check if the diffirence is within the tolerance else change horizontal angle
{
if (avl > avr)
{
servoh = --servoh;
if (servoh < 0)
{
servoh = 0;
}
}
else if (avl < avr)
{
servoh = ++servoh;
if (servoh > 180)
{
servoh = 180;
}
}
else if (avl == avr)
{
// nothing
}
horizontal.write(servoh);
}
delay(dtime);
}