import java.util.Objects;
import java.util.Scanner;
//import java.util.
public class Main {
public static void main(String[] args) {
start:
//1 naujas dalykas - break su label
{
double no1 = 0;
double no2 = 0;
double result;
String[] symbols = {"*", "/", "+", "-"}; //2 naujas dalykas String array
char sym;
String yesno;
System.out.println("Incomplete calculator");
System.out.println("Enter the first number");
Scanner input1 = new Scanner(System.in);
no1 = input1.nextDouble();
System.out.println("Enter the second number");
Scanner input2 = new Scanner(System.in);
no2 = input2.nextDouble();
System.out.println("Enter what operation you want to do (+; -; *; /)");
Scanner input3 = new Scanner(System.in);
sym = input3.next().charAt(0);
if (sym.equals(symbols)) {
System.out.println("Illegal operation");
break start;
} else
if (no2 == 0) {
break start;
} else if (Objects.equals(sym, "+")) {
result = no1 + no2;
System.out.println(result);
System.out.println("Do you want to keep calculating?");
Scanner input4 = new Scanner(System.in);
yesno = input4.nextLine();
if (yesno == "yes") {
break start;
} else ;
}
}
}
}
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