计算器的简单实现

java实现简单的计算器功能

 1 package com.su.jichu;
 2 
 3 import com.sun.xml.internal.ws.api.model.wsdl.WSDLOutput;
 4 
 5 import java.util.Scanner;
 6 
 7 public class jsq {
 8     public static void main(String[] args) {
 9         Scanner scanner = new Scanner(System.in);
10         double a = scanner.nextInt();
11         char c = scanner.next().charAt(0); //将获取到的第一个char类型赋值给b
12         double b = scanner.nextInt();
13         System.out.println(a+""+""+c+""+b);
14         switch (c){
15             case '+' : jia(a,b);   break;
16             case '-': jian(a,b);  break;
17             case '*' : chen(a,b);  break;
18             case '/' : chu(a,b);   break;
19             default:
20                 System.out.println("输入有误！！");
21                 break;
22         }
23     }
24     public static void jia(double a,double b)
25     {
26         double sum  =a + b;
27         System.out.println("sum="+sum);
28 
29     }
30     public  static  void jian(double a,double b)
31     {
32         double sum=0;
33         if(a>b){
34         sum=a-b;
35         }else{
36           sum=-(b-a);
37         }
38         System.out.println("sum="+sum);
39 
40     }
41     public static void chen(double a,double b)
42     {
43         double sum = a*b;
44         System.out.println("sum="+sum);
45 
46     }
47     public static void chu(double a,double b)
48     {
49         double sum = a /b;
50         System.out.println("sum="+sum);
51 
52     }
53 }