JAVA--method--加减乘除计算器_method 减法

package com.guo.operator.method;

import java.util.Scanner;

public class Demo05 {
    public static void main(String[] args) {
        double x;
        double y;
        String caozuo;
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("请输入需要操作的两个数：");
            x = scanner.nextDouble();
            y = scanner.nextDouble();
            System.out.println("请输入你需要的+-*/操作：");
            caozuo = scanner.next();
            switch (caozuo) {
                case "+":
                    System.out.println(jia(x, y));
                    break;
                case "-":
                    System.out.println(jian(x, y));
                    break;
                case "*":
                    System.out.println(chen(x, y));
                    break;
                case "/":
                    System.out.println(chu(x, y));
                    break;
            }
        }
    }
    public static double jia(double a,double b){
        return a+b;
    }
    public static double jian(double a,double b){
        return a-b;
    }
    public static double chen(double a,double b){
        return a*b;
    }
    public static double chu(double a,double b){
        return a/b;
    }
}

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