Comparaciones y lógica · C++

#include <iostream>#include <string>int main() {    int age = 16;    bool withAdult = true;    double temperature = 31.5;    // A comparison gives a bool: true or false.    bool adult = age >= 18;    std::cout << "adult = " << adult << '\n';  // by default, 0 or 1    std::cout << std::boolalpha;               // from now on, false or true    std::cout << "adult = " << adult << '\n';    std::cout << "age == 16: " << (age == 16) << ", age != 16: " << (age != 16) << '\n';    // && (and): both must be true. || (or): at least one. ! (not) reverses.    bool canEnter = adult || withAdult;    std::cout << "Can see the film: " << canEnter << '\n';    bool hotDay = temperature > 30 && temperature <= 45;    std::cout << "Hot day: " << hotDay << ", not hot: " << !hotDay << '\n';    // Short-circuit: if the left side decides, the right one is not evaluated.    int boxes = 0, items = 12;    if (boxes != 0 && items / boxes > 5) std::cout << "The boxes are full\n";    else std::cout << "No boxes to check (and no division by zero)\n";    // Strings are compared in alphabetical order.    std::string a = "apple", b = "banana";    std::cout << a << " < " << b << ": " << (a < b) << '\n';    return 0;}