import java.util.*;

public class Calculator {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        boolean z = true;
        System.out.println("command list : +,*,-,/,%,^");
        String[] operation = new String[]{"+", "*", "-", "/", "%"};
        while (z) {
            System.out.println("Enter example");
            String example = sc.nextLine();
            String[] strArr = new String[operation.length];
            String oper = null;
            for (int i = 0; i < operation.length; i++) {
                if (example.contains(operation[i])) {
                    oper = operation[i];
                    strArr = example.split("\\" + operation[i]);
                    break;
                }
            }
            double intArr[] = new double[strArr.length];
            for (int i = 0; i < strArr.length; i++) {
                intArr[i] = Double.valueOf(strArr[i]);
            }
            double x = intArr[0];
            double y = intArr[1];


            switch (oper) {
                case "+":
                    System.out.println(sum(x, y));
                    break;
                case "/":

                    System.out.println(division(x, y));
                    break;
                case "*":
                    System.out.println(multi(x, y));
                    break;
                case "%":
                    System.out.println(percent(x, y));
                    break;
                case "-":
                    System.out.println(substr(x, y));
                    break;
                case "^":
                default:


            }

        }
    }


    public static double sum(double x, double y) {
        return x + y;
    }

    public static double division(double x, double y) {
        return x / y;
    }

    public static double multi(double x, double y) {
        return x * y;
    }

    public static double percent(double x, double y) {
        while (x > 0) {
            x -= y;
        }
        x += y;
        return x;
    }


    public static double substr(double x, double y) {

        return x - y;
    }


}