/**
 * 温度转换程序
 * 支持摄氏度和华氏度的互相转换
 * @author 陈全文
 * @version 1.0
 */
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.println("===== 温度转换程序 =====");
        System.out.println("1. 摄氏度 -> 华氏度");
        System.out.println("2. 华氏度 -> 摄氏度");
        System.out.print("请选择转换类型 (1/2): ");
        
        String choice = scanner.nextLine();
        
        if (choice.equals("1")) {
            System.out.print("请输入摄氏度: ");
            double celsius = scanner.nextDouble();
            double fahrenheit = celsiusToFahrenheit(celsius);
            System.out.println(celsius + "°C = " + fahrenheit + "°F");
            
        } else if (choice.equals("2")) {
            System.out.print("请输入华氏度: ");
            double fahrenheit = scanner.nextDouble();
            double celsius = fahrenheitToCelsius(fahrenheit);
            System.out.println(fahrenheit + "°F = " + celsius + "°C");
            
        } else {
            System.out.println("无效选择，请输入1或2");
        }
        
        scanner.close();
    }
}