C++ :: Getting Error Using Enum In If Statement?

I'm trying to make a simple C++ program in which the user must try to guess a number, if they guess too high it says "too high" and if they guess too low it says "too low".

I also decided to add a feature which allows them to select how many tries they would like to guess the number. I tried to make "tries" type an enum so if the user could not pick an invalid number but for some reason i cannot use it in an if statement.

here is the code and i am getting the first error on line 27:

Code:
#include <iostream>
#include <ctime>
#include <cstdlib>
using namespace std;
int guess;

[Code]....