#include <iostream>

void initialize_screen();
double celsius(double fahrenheit);
void show_results(double f_degrees, double c_degrees);

int main()
{
    using namespace std;
    double f_temperature, c_temperature;
    
    initialize_screen();
    cout << "I will convert a Fahrenheit temperature "
        << "to Celsius.\n"
        << "Enter a temperature in  Fahrenheit: ";
    cin >> f_temperature;
    
    c_temperature = celsius(f_temperature);
    
    show_results(f_temperature, c_temperature);
    return 0;
}

void initialize_screen()
{
    using namespace std;
    cout << endl;
    return;
}

double celsius(double fahrenheit)
{
    return ((5.0/9.0)*(fahrenheit - 32));
    
}

void show_results(double f_degrees, double c_degrees)
{
    using namespace std;
    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.precision(1);
    cout << f_degrees
        << " degrees Fahrenheit is equivalent to\n"
        << c_degrees << " degrees Celsius.\n";
    return;
}