How to use while (true) loop to write a program like this:

[PokLai123]

How to use while (true) loop to write a program like this:

Welcome to My Number Guessing Game.
I have a number in mind and you have to guess it.
In your input below, enter the comparator
followed by your guess. E.g. "= 15?"

At present only the '=' comparator is supported. Pretty soon
You will be able to enter less than and greater than as well.
E.g. "< 15?" or "> 15"

Good luck!

1. Take a guess at the number (1-25) I have in mind: [ENTER]
1. Take a guess at the number (1-25) I have in mind: 1
Only the equals comparator (=) is supported in this release. Try again
2. Take a guess at the number (1-25) I have in mind: =1?
Nopes. Try again.
3. Take a guess at the number (1-25) I have in mind: <1?
Only the equals comparator (=) is supported in this release. Try again
4. Take a guess at the number (1-25) I have in mind: [ENTER]
4. Take a guess at the number (1-25) I have in mind: [ENTER]
4. Take a guess at the number (1-25) I have in mind: =2
Nopes. Try again.
5. Take a guess at the number (1-25) I have in mind: =3?
Nopes. Try again.
6. Take a guess at the number (1-25) I have in mind: = 4?
Nopes. Try again.
7. Take a guess at the number (1-25) I have in mind: = 5?
Nopes. Try again.
8. Take a guess at the number (1-25) I have in mind: =6?
Nopes. Try again.
… etc …
18. Take a guess at the number (1-25) I have in mind: =16
Yay! You have guessed it!
You used 18 guesses.
Bye now.
Program ended with exit code: 0



And this is what I wrote for this code... and I got stuck at this point...

#include <iostream>
#include <string>
#include <sstream>


using namespace std;



int main(int argc, const char * argv[])
{
    cout <<"Welcome to My Number Guessing Game. \n";
    cout <<"I have a number in mind and you have to guess it. \n";
    cout <<"In your input below, enter the comparator \n";
    cout <<"followed by your guess. E.g. \"= 15?\" \n \n";
    
    cout <<"At present only the '=' comparator is supported. Pretty soon\n";
    cout <<"You will be able to enter less than and greater than as well.\n";
    cout <<"E.g. \"< 15?\" or \"> 15\"\n";
    cout <<"Good luck! \n";
    
    char comparator;
    int guess;
    
    cin >> comparator;
    cin >> guess;
    
    istringstream = cin;
    
    istringstream (string userInput) >>comparator >>guess;