#include <iostream>

using namespace std;

#define VERBOSE

void celsiusToFahrenheit(double celsius) {
    double fahrenheit = 32 + (9.0 / 5.0 * celsius);
    cout << "temperature in fahrenheit: " << fahrenheit << endl;
#ifdef VERBOSE
    cout << "F = 32 + (9/5 * " << celsius << ")" << endl;
    cout << "F = " << fahrenheit << endl;
#endif

    if (celsius >= 100)
        cout << "temp is: boiling temp\n";
    else if (celsius >= 40)
        cout << "temp is: very hot\n";
    else if (celsius >= 20)
        cout << "temp is: warm\n";
    else if (celsius >= 10)
        cout << "temp is: cold\n";
    else if (celsius >= 0)
        cout << "temp is: almost freezing\n";
    else
        cout << "temp is: freezing\n";
}

void fahrenheitToCelsius(double fahrenheit) {
    double celsius = (fahrenheit - 32) * 5.0 / 9.0;
    cout << "temperature in celsius: " << celsius << endl;
#ifdef VERBOSE
    cout << "C = (F - 32) * 5/9" << endl;
    cout << "C = " << celsius << endl;
#endif

    if (celsius >= 100)
        cout << "temp is: boiling temp\n";
    else if (celsius >= 40)
        cout << "temp is: very hot\n";
    else if (celsius >= 20)
        cout << "temp is: warm\n";
    else if (celsius >= 10)
        cout << "temp is: cold\n";
    else if (celsius >= 0)
        cout << "temp is: almost freezing\n";
    else
        cout << "temp is: freezing\n";
}

int main() {
    char option;
    double temperature;

    cout << "select an option:\n";
    cout << "1: celsius to fahrenheit\n";
    cout << "2: fahrenheit to celsius\n";
    cin >> option;

    if (option == '1') {
        cout << "enter temperature in celsius: ";
        cin >> temperature;
        celsiusToFahrenheit(temperature);
    }
    else if (option == '2') {
        cout << "enter temperature in fahrenheit: ";
        cin >> temperature;
        fahrenheitToCelsius(temperature);
    }
    else {
        cout << "invalid input\n";
    }

    return 0;
}