带有do函数的无限循环

我对C++和编程非常陌生，需要一些帮助。我不明白为什么当电脑猜到我的号码时，它会无限循环。目前，我已经在末尾添加了一个break函数。如有任何建议，我们将不胜感激。

// Computer guesses number
#include <iostream>
#include <ctime>
#include <cstdlib>
using namespace std;
int main()
{
srand(static_cast<unsigned int>(time(0))); // Generates random number
int myNumber; // My number.
int computersNumber = 0; 
int tries = 0;
int highest = 100; // Highest number the computer has put.
int lowest = 1; // Lowest number the computer has put.
cout << "tHello, in this game the computer will try to find your number.nn";
cout << "Please insert your number ( 1 - 100 ): ";
cin >> myNumber; // My number, that the computer is going to guess.
while (myNumber <= 0 || myNumber >= 101) // Checks if user has inputed a legal number.
{
cout << "You entered an illegal number. Please type a new one.n";
cin >> myNumber; // If user made an illegal choice it asks to input a new one.
} 
do
{
int computersNumber = rand() % (highest - lowest) + lowest;
++tries; // adds +1 every time computer guesses wrong number.
if (myNumber > computersNumber)
{
cout << "The computer guessed: " << computersNumber << "n";
lowest = computersNumber + 1;
}
else if (myNumber < computersNumber)
{
cout << "The computer guessed: " << computersNumber << "n";
highest = computersNumber - 1;
}
else
{
cout << "Computer guessed your number in " << tries << " tries.n";
break; // infinite loop if this wasn't here.
}
} while (myNumber != computersNumber);
return 0;
}