C为什么这个变量会返回一个随机值？

#include <iostream>
#include <cstdlib>
#include <ctime>

using namespace std;

int main()
{
int randomNumber;
int guess;
int guesses;

srand((unsigned)time(0));
randomNumber = (rand()%10)+1;

cout << "I am thinking of a number between 1 to 10. Can you guess it?" << endl;

while(guess != randomNumber){
    cout << "That is not correct,try again.";
    guesses++;
    cin >> guess;
}

if(guess == randomNumber){
    cout << "Good Job. Guesses: " << guesses << endl;
    guesses++;
}

return 0;
}