public static void Main()
Console.WriteLine("Enter C to convert to Celsius or F to convert to Fahrenheit:");
choice = Console.ReadLine();
if (choice == "C" || choice == "c")
temperature = GetTemperature("Fahrenheit");
result = CalculateCelsius(temperature);
DisplayResult(temperature, "Fahrenheit", result, "Celsius");
Console.WriteLine("Enter C to convert to Celsius or F to convert to Fahrenheit:");
choice = Console.ReadLine();
temperature = GetTemperature("Celsius");
result = CalculateFahrenheit(temperature);
DisplayResult(temperature, "Celsius", result, "Fahrenheit");
Console.WriteLine("Enter C to convert to Celsius or F to convert to Fahrenheit:");
choice = Console.ReadLine();
Console.WriteLine("You must enter C to convert to Celsius or F to convert to Fahrenheit.");
choice = Console.ReadLine();
else if (choice == "F" || choice == "f")
temperature = GetTemperature("Celsius");
result = CalculateFahrenheit(temperature);
DisplayResult(temperature, "Celsius", result, "Fahrenheit");
Console.WriteLine("Enter C to convert to Celsius or F to convert to Fahrenheit:");
choice = Console.ReadLine();
temperature = GetTemperature("Fahrenheit");
result = CalculateCelsius(temperature);
DisplayResult(temperature, "Fahrenheit", result, "Celsius");
Console.WriteLine("Enter C to convert to Celsius or F to convert to Fahrenheit:");
choice = Console.ReadLine();
Console.WriteLine("You must enter C to convert to Celsius or F to convert to Fahrenheit.");
choice = Console.ReadLine();
Console.WriteLine("You must enter C to convert to Celsius or F to convert to Fahrenheit.");
choice = Console.ReadLine();
temperature = GetTemperature("Fahrenheit");
result = CalculateCelsius(temperature);
DisplayResult(temperature, "Fahrenheit", result, "Celsius");
temperature = GetTemperature("Celsius");
result = CalculateFahrenheit(temperature);
DisplayResult(temperature, "Celsius", result, "Fahrenheit");
Console.WriteLine("You must enter C to convert to Celsius or F to convert to Fahrenheit.");
private static double GetTemperature(string label)
Console.WriteLine("Enter " + label + " temperature:");
input = Console.ReadLine();
temperature = Convert.ToDouble(input);
private static double CalculateCelsius(double fahrenheit)
celsius = (fahrenheit - 32) * 5 / 9;
private static double CalculateFahrenheit(double celsius)
fahrenheit = celsius * 9 / 5 + 32;
private static void DisplayResult(double fahrenheit, string fromLabel, double celsius, string toLabel)
Console.WriteLine(fahrenheit.ToString() + "° " + fromLabel + " is " + celsius.ToString() + "° " + toLabel);