import java.util.Scanner;
class Main {
public static void main(String[] args) {
char operator;
Double number1, number2, result;
Scanner input = new Scanner(System.in);
System.out.println("Choose an operator: +, -, *, /");
operator = input.next().charAt(0);
System.out.println("Enter the first number");
number1 = input.nextDouble();
System.out.println("Enter the second number");
number2 = input.nextDouble();
switch (operator) {
...
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