How does the given function improve the code versus if no function was present? double FahrenheitToCelsius(double fahrenheit) { return (fahrenheit - 32.0) * 5.0 / 9.0; } int main() { double fahrenheit; cin >> fahrenheit; int c1; int c2; int c3; c1 = FahrenheitToCelsius(fahrenheit); c2 = FahrenheitToCelsius(32.0); c3 = FahrenheitToCelsius(72.0); }