C++ A6 submitted file

#include <iostream>
#include <random>
#include <iomanip>
#include <chrono>
#include <math.h>
//@writer 5396952 Hyeonmin LEE
using namespace std;
int guessNum(int , int*);
int guessGame();
int main() {
 while(1){

        if (guessGame() == -1){
            break;
        }
    }

return 0;
}
int guessNum(int number) {
int count = 0;
int input = 1;
 while(1) {
  count ++;
     cin >> input;

  if(!cin || !(input <=1000 && input >= 1)) {
         cin.clear();
         cin.ignore(1001, '\n');
         cout << "Invalid data type or out of range!" << endl;
   cout << "Please enter right value." << endl;
     }

      if (input < number) {
         cout << "Too low. Try again." << endl;
  };

     if (input > number) {
        cout << "Too high. Try again." << endl;
     }
  
     if(input == number){
        cout << "Excellent! You guessed the number!" << endl;
        return count;
   break;
     }
    }

 //return count;
};
int guessGame(){
 char again = 'n';
 int logCount = log2(1000) + 1;

 unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
 default_random_engine engine(seed);
 uniform_int_distribution<unsigned int> randomNum(1, 1000);
 int number = randomNum(engine);
 cout << "I have number between 1 and 1000." << endl;
 cout << "Can you guess my number?" << endl;
 cout << "Please type your first guess" << endl;
 int checkCount = guessNum(number);
//putting the funtion in condtion, declearation calls the funtion!!! watch out!
 if(checkCount < logCount){
  cout << "Either you know the secret or you got lucky!" << endl;
 }
 else if (checkCount == logCount){
  cout << "Ahah! You know the secret!" << endl;
 }
 else if (checkCount > logCount){
  cout << "You should be able to do better!" << endl;
 }

 cout << "would you like to play again?(y or n)" << endl;
    cin >> again;
    if (again == 'n'){
        return -1;
        }
   
    return 0;
}

//special thanks for my great teacher && friend, Sascha "Kevin" Brun!!!