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);
}
}
}
