做一个简易计算器，用户输入两个数，实现加减乘除

package com.xiong.dan;
import java.util.Scanner;
public class calculator2 {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);double a=0,b=0;System.out.println("请输入第一个数：");if(scanner.hasNextDouble()){a= scanner.nextDouble();}else{System.out.println("错误！");}System.out.println("请输入第二个数：");if(scanner.hasNextDouble()){b= scanner.nextDouble();}else{System.out.println("错误！");}System.out.println("请输入+-*/:");String sign =scanner.next();switch (sign){case "+":add(a,b);break;case "-":jian(a,b);break;case "*":cheng(a,b);break;case "/":chu(a,b);break;default:System.out.println("输入错误！");break;}scanner.close();}public static void add(double a,double b){double sum=a+b;System.out.println(a+"+"+b+"="+sum);}public static void jian(double a,double b){double sum=a-b;System.out.println(a+"-"+b+"="+sum);}public static void cheng(double a,double b){double sum=a*b;System.out.println(a+"*"+b+"="+sum);}public static void chu(double a,double b){double sum=a/b;if(b==0){System.out.println("除数不能为0！");}else{System.out.println(a+"/"+b+"="+sum);}}}

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