第二章2

package com.bdqn.dome1;


public class Calculator {
     public int add(int num1,int num2){
    return num1+num2;
     }
     public int minus(int num1,int num2){
    return num1-num2;
     }
     public int multiple(int num1,int num2){
    return num1*num2;
     }
     public int divide(int num1,int num2){
    return num1/num2;
     }
}

package com.bdqn.dome1;

import java.util.Scanner;


public class Calculator2 {
public static void main(String[] args) {
  Calculator a =new Calculator();
  Scanner input =new Scanner(System.in);
  System.out.println("请输入第一个算数数字：");
  int num1 =input.nextInt();
  System.out.println("请输入第二个算数数字：");
  int num2 =input.nextInt();
  System.out.println("请输入进行的数字");
  String c = input.next();
  switch (c) {
case "+":
System.out.println("加"+a.add(num1, num2));
break;


case "-":
System.out.println("减"+a.minus(num1, num2));
break;
case "*":
System.out.println("乘"+a.multiple(num1, num2));
break;
case "/":
System.out.println("除"+a.divide(num1, num2));
break;
default:
break;
}
}
}