简易计算器

public class Demo07 {
    public static void main(String[] args) {
        //简易计算器
        System.out.println("请输入计算的数：");
        computer();
    }
    public static void computer(){
        Scanner scanner = new Scanner(System.in);
        double a = scanner.nextDouble();

        Scanner scanner1 = new Scanner(System.in);
        String c = scanner1.nextLine();

        Scanner scanner2 = new Scanner(System.in);
        double b = scanner2.nextDouble();
        switch (c){
            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:
                break;
        }
        scanner.close();
    }
}