加减乘除计算器

package com.main.cul;
import java.util.Scanner;
public class Demo {
    private static double result;
    public static void main(String[] argv){
    
    try{
        
        Scanner in=new Scanner(System.in);
        System.out.print("请输入数字A：");
        double numA=in.nextDouble();
        
        System.out.print("请选择操作+-*/(加减乘除)：");
        String strOper=in.next();
        char  operate=strOper.charAt(0);
        
        System.out.print("请输入数字B：");
        double numB=in.nextDouble();

        switch (operate) {
        case '+':
            result =numA+numB; 
            break;
        case '-':
            result =numA-numB;  
            break;
        case '*':
            result =numA*numB;  
            break;
        case '/':
            result =numA/numB;  
            break;
        }
    
        System.out.print("结果为"+result);
        
    }catch (Exception e) {
        // TODO: handle exception
        e.printStackTrace();
    }
    }
}