import java.util.Scanner;

public class TemperatureConverter {
    
    // 将摄氏度转换为华氏度
    public static double celsiusToFahrenheit(double c) {
        return c * 9.0 / 5.0 + 32.0;
    }
    
    // 将华氏度转换为摄氏度
    public static double fahrenheitToCelsius(double f) {
        return (f - 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（例如 36.6 C 或 97 F）：");
        String input = scanner.nextLine().trim();
        
        if (input.isEmpty()) {
            System.out.println("输入为空，程序退出。");
            scanner.close();
            return;
        }
        
        String[] parts = input.split(" ");
        double value;
        String unit;
        
        try {
            value = Double.parseDouble(parts[0]);
            if (parts.length > 1) {
                unit = parts[1].toUpperCase();
            } else {
                unit = "C";
            }
        } catch (Exception e) {
            System.out.println("输入解析失败，请按示例输入数值与单位，例如：36.6 C");
            scanner.close();
            return;
        }
        
        if (unit.startsWith("C")) {
            double f = celsiusToFahrenheit(value);
            System.out.printf("%.2f °C = %.2f °F%n", value, f);
        } else if (unit.startsWith("F")) {
            double c = fahrenheitToCelsius(value);
            System.out.printf("%.2f °F = %.2f °C%n", value, c);
        } else {
            System.out.println("未知单位，请使用 C 或 F。");
        }
        
        scanner.close();
    }
}