写一个计算机，要求实现加减乘除功能，并且能够循环接收新数据，通过用户交
代码思路：1.写4个方法：加减乘除；每个方法输入两个数据，并传出操作结果。
2.main()中利用for循环和switch进行用户交互，并退出循环。
import java.util.Scanner;
public class calculation {
public static void main(String[] args) {
System.out.println("==========简单计算机===========");
System.out.println("1.加法\t" + "2.减法\t" + "3.乘法\t" + "4.除法\t" + "5.退出");
Scanner scanner = new Scanner(System.in);
for ( ; ; ){
System.out.println("请输入您想要进行的操作：");
int s =scanner.nextInt();
switch (s){
case 1:
add();
break;
case 2:
reduce();
break;
case 3:
ride();
break;
case 4:
divide();
break;
case 5:
break;
default:
System.out.println("输入的操作符号有误！");
System.out.println();
}
if (s==5){
scanner.close();
System.out.println("退出循环！");
break;
}
}
}
public static void add(){
Scanner scanner2 = new Scanner(System.in);
System.out.println("输入第一个数x：");
double x = scanner2.nextDouble();
System.out.println("输入第二个数y：");
double y = scanner2.nextDouble();
System.out.println("================================");
System.out.println("x + y = "+(x+y)+"\n");
}
public static void reduce(){
Scanner scanner2 = new Scanner(System.in);
System.out.println("输入第一个数x：");
double x = scanner2.nextDouble();
System.out.println("输入第二个数y：");
double y = scanner2.nextDouble();
System.out.println("================================");
System.out.println("x - y = "+(x-y)+"\n");
}
public static void ride(){
Scanner scanner2 = new Scanner(System.in);
System.out.println("输入第一个数x：");
double x = scanner2.nextDouble();
System.out.println("输入第二个数y：");
double y = scanner2.nextDouble();
System.out.println("================================");
System.out.println("x * y = "+(x*y)+"\n");
}
public static void divide(){
Scanner scanner2 = new Scanner(System.in);
System.out.println("输入第一个数x：");
double x = scanner2.nextDouble();
System.out.println("输入第二个数y：");
double y = scanner2.nextDouble();
System.out.println("================================");
if (y==0){
System.out.println("除数不能为0！"+"\n");
}else {
System.out.println("x / y = "+(x/y)+"\n");
}
}
}
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