import java.util.Scanner;

/**
 * @author 蓝色以太
 * 通过键盘接收数值和字符，实现计算器功能。
 */
public class Calculator {

    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入第一个数值：");
        double num1=sc.nextDouble();
        System.out.println("请输入运算字符(+-*/):");
        String ch=sc.next();
        System.out.println("请输入第二个数值：");
        double num2=sc.nextDouble();
        switch(ch){
            case "+":{
                System.out.println(num1+"+"+num2+"="+(num1+num2));
                break;
            }
            case "-":{
                System.out.println(num1+"-"+num2+"="+(num1-num2));
                break;
            }
            case "*":{
                System.out.println(num1+"*"+num2+"="+(num1*num2));
                break;
            }
            case "/":{
                System.out.println(num1+"/"+num2+"="+(num1/num2));
                break;
            }
            default :{
                System.out.println("输入错误！");
                break;
            }
        }
    }
}