import java.util.Scanner;

public class TemperatureConverter {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        System.out.println("=== 温度转换程序 ===");
        System.out.print("请输入温度值：");
        double value = sc.nextDouble();
        
        System.out.print("请输入单位（C/F）：");
        String unit = sc.next();

        if (unit.equalsIgnoreCase("C")) {
            double f = value * 9 / 5.0 + 32;
            System.out.printf("%.2f℃ = %.2f℉%n", value, f);
        } else if (unit.equalsIgnoreCase("F")) {
            double c = (value - 32) * 5 / 9.0;
            System.out.printf("%.2f℉ = %.2f℃%n", value, c);
        } else {
            System.out.println("输入错误！请输入 C 或 F");
        }
        
        sc.close();
    }
}