作业5.1

import java.text.DecimalFormat;
import java.util.Scanner;

public class Zhidao {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        try {
            System.out.print("请输入第一个数：");
            double x = scanner.nextDouble();
            System.out.print("请输入第二个数：");
            double y = scanner.nextDouble();
            System.out.print("请输入运算符：");
            String s = scanner.next();
            char z = s.charAt(0);
            js.yunsuan(x, y, z);
        } catch (Exception e) {
            System.out.println("请输入正确的数据！");

        }

    }

}


import java.text.DecimalFormat;

public class js {

    public static void yunsuan(double x, double y, Character z) {
        DecimalFormat r = new DecimalFormat();
        r.applyPattern("#0.00");
        if (z.equals(‘+‘)) {
            System.out.println(x + "+" + y + "=" + r.format((x + y)));
        } else if (z.equals(‘-‘)) {
            System.out.println(x + "-" + y + "=" + r.format((x - y)));
        } else if (z.equals(‘*‘)) {
            System.out.println(x + "*" + y + "=" + r.format((x * y)));
        } else if (z.equals(‘/‘)) {
            if (y == 0) {
                System.out.println("被除数不能为0");
            } else {
                System.out.println(x + "/" + y + "=" + r.format((x / y)));
            }

        } else {
            System.out.println("无法识别改运算符");
        }
    }

}


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