import java.util.Scanner;
public class TemperatureConverter{
    public static double celsiusToFahrenheit(double celsius){
        return celsius * 9.0/5.0 + 32.0;
    }
    public static double fahrenheitToCelsius(double fahrenheit){
        return (fahrenheit - 32.0) * 5.0 / 9.0;
    }
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要转换的温度与单位：");
        String input = scanner.nextLine().trim();
        if (input.isEmpty()){
            System.out.println("输入为空，程序退出。");
            return;
        }
        try{
            double value = Double.parseDouble(parts[0]);
            String unit = 'C';
            if (parts.length > 1){
                unit = parts[1].toUpperCase();
            }
            if (unit.startsWith('C')){
                double f = celsiusToFahrenheit(value);
                System.out.printf("%.1f℃ = %.2f℉%n",value,f);
            } else if (unit.startsWith("F")){
                double c = fahrenheitToCelsius(value);
                System.out.println("未知单位，请使用C或F。");
            }
        } catch (NumberFormatExpectation e){
            System.out.println("输入解析失败，请按示例输入数值与单位。");
        } catch (Expectation e){
            System.out.println("输入格式错误，请检查输入。");
        } finally {
            scanner,close();
        }
    }
}