switch的Scanner计算..

/**
 *  需求：基本练习,输入/*-+运算；
 *  思路：switch
 *  {
 *  case:
 *  break;
 *  }  语句；
 *   
 *  步骤：略
 */
import java.util.Scanner;
public class Demo_1{
    public static void main(String[] arge) {
        Scanner input = new Scanner(System.in);
        System.out.println("please enter a /or*or-or+: ");
        char option=input.next().charAt(0);//输入/*-+
        Scanner input1 = new Scanner(System.in);
        System.out.println("please enter tow number a and b ");
        int a = input1.nextInt();
        int b= input1.nextInt();
        switch (option)
        {
            
        case '+':
            System.out.println("a+b="+(a+b));
            break;
        case '-':
            System.out.println("a-b="+(a-b));
            break;
        case '*':
            System.out.println("a*b="+(a*b));
            break;
        case '/':
            System.out.println("a/b="+(a/b));
            break;
        case '%':
            System.out.println("a%b="+(a%b));
            break;
        default:
            System.out.println("a%b="+(a%b));
            break;
        }

    }
}

 

---

分支的位置可以自由调整！

分支的内容可以省略！