package rekenmachine;

import java.util.Scanner;

//Program used to calculate small sums

/**
 * @author Yannick Sminia
 */
public class Rekenmachine {

    //Validating the operator
    public static boolean isValidOperator(char operator) {
        return operator == '-' || operator == '+' || operator == '*' || operator == '/' || operator == '%';
    }

    //Answer input and loop
    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        char operator = 1;

        //Input loop
        while (operator != 's') {
            System.out.print("Operator (S = stoppen) : ");
            operator = input.next().charAt(0);

            if (isValidOperator(operator)) {

                System.out.print("Eerste getal: ");
                double number1 = input.nextDouble();
                System.out.print("Tweede getal: ");
                double number2 = input.nextDouble();

                printSum(operator, number1, number2);

            } else {
                //Invalid operator error
                if(operator != 's'){
                    System.out.println("Operator is ongeldig\n"
                        + "");
                }
            }
        }

    }

    //Calculting and printing the answer
    public static void printSum(char operator, double number1, double number2) {

        //Logic to see which operator to use
        double answer = 1;
        if (operator == '-') {
            answer = number1 - number2;
        }
        if (operator == '+') {
            answer = number1 + number2;
        }
        if (operator == '*') {
            answer = number1 * number2;
        }
        if (operator == '/' || operator == '%') {
            answer = number1 / number2;
        }

        //Printing sum with answer
        System.out.println(number1 + " " + operator + " " + number2 + " = " + answer + "\n"
                + "");
    }

}