#include <iostream>

// Function declarations
int main();

// Function definitions

// This program asks the user to enter a temperature and
// then asks whether that temperature is in degrees Celsius
// or degrees Fahrenheit.
//
// If the temperature is in degrees Celsius, the program
// converts it to degrees Fahrenheit and prints the result.
// Otherwise, the temperature is in degrees Fahrenheit, so
// the program converts it to degrees Celsius and prints
// the result.
//
// Run this program using several different sample inputs
// and determine whether it works correctly.
//
// Choose test cases for which you know the expected results.
// Be sure to test both conversions:
//
//     Celsius    -> Fahrenheit
//     Fahrenheit -> Celsius
//
// If the program works correctly, document the test cases
// you used and the results you expected.
//
// If the program does not work correctly, identify the
// problem, fix the bug, and test the program again.
//
// This question was designed with help from Wani Gupta.

int main() {
    while ( true ) {
        double temp{};

        std::cout << "Enter a temperature (Celsius or Fahrenheit): ";
        std::cin >> temp;

        bool in_celsius{};

        std::cout << "Is this temperature in Celsius?" << std::endl;
        std::cout << "  Enter 1 for yes, 0 for no: ";
        std::cin >> in_celsius;

        if ( in_celsius ) {
            //       9
            // T  = --- T  + 32
            //  F    5   C

            temp = (9/5)*temp + 32;

            std::cout << "The temperature in Fahrenheit is "
                      << temp << std::endl;
        } else {
            //       5
            // T  = --- (T  - 32)
            //  C    9    F

            temp = (5/9)*(temp - 32);

            std::cout << "The temperature in Celsius is "
                      << temp << std::endl;
        }

        std::cout << std::endl;
    }

    return 0;
}