While loop type comparisons

whilecomparison.cpp

#include <iostream>
#include <string>
using namespace std;

int main () {
    //Good
    string input;
    do {
        cout << "Enter foo: ";
        cin >> input;
    } while (input.compare("foo"));
    
    //Okay
    cout << "Enter bar: ";
    cin >> input;
    while (input.compare("bar")) {
        cout << "Enter bar: ";
        cin >> input;
    }
    //Bad   
    while (true) {
        cout << "Enter baz: ";
        cin >> input;
        if (!input.compare("bar")) { break; }
    }
}