import java.util.Scanner;

public class calculator {

    public static void main (String args[]) {

        Scanner number = new Scanner(System.in);
        double num1,num2,answer;
        char operator;

        System.out.println("Enter first number: ");
        num1 = number.nextDouble();

        operator = number.nextChar(); /* the "nextChar" is not correct */

        System.out.println("Enter second number: ");
        num2 = number.nextDouble();

        if (operator = '+'){
            answer = num1 + num2; /* If statements do not work like this */
        }                             /* I would use "else if", unsure if it allows */
        if (operator = '-'){
            answer = num1 - num2;
        }
        if (operator = '*'){
            answer = num1 - num2;
        }
        if (operator = '/'){
                answer = num1 / num2;
        }

        System.out.println(num1 + num2 + operator + answer);

    }
}

import java.util.Scanner;

public class calculator{

    public static void main (String args[]) {

        Scanner userInput = new Scanner(System.in);

        String operator;
        double num1,num2,answer = 0;



        System.out.println("Enter first number: ");
        num1 = userInput.nextDouble();

        System.out.println("Enter operator: ");
        operator = userInput.next();


        System.out.println("Enter second number: ");
        num2 = userInput.nextDouble();

        if (operator.equals ("+")){
            answer = num1 + num2;
        }
        else if (operator.equals ("-")){
            answer = num1 - num2;
        }
        else if (operator.equals ("*")){
            answer = num1 * num2;
        }
        else if (operator.equals ("/")){
                answer = num1 / num2;
        }

        System.out.println("First number:" + num1);
        System.out.println("Operator:" + operator);
        System.out.println("Second number:" + num2);

        System.out.println("Answer: " + answer);
    }
}

public class Tester4 {

    public static void main(String args[]) {

        Scanner input = new Scanner(System.in);
        double num1, num2, answer = 0;
        String operator;

        System.out.println("Enter first number: ");
        num1 = input.nextDouble();

        System.out.println("Enter operator: ");
        operator = input.next();

        System.out.println("Enter second number: ");
        num2 = input.nextDouble();

        if(operator.equals("+")) {
            answer = num1 + num2;
        } else if(operator.equals("-")) {
            answer = num1 - num2;
        } else if(operator.equals("*")) {
            answer = num1 - num2;
        } else if(operator.equals("/")) {
            answer = num1 / num2;
        }

        System.out.println("First number:" + num1);
        System.out.println("Operator:" + operator);
        System.out.println("Second number:" + num2);

        System.out.println("Answer: " + answer);
    }

}

Scanner sc = new Scanner("abc");
char ch = sc.findInLine(".").charAt(0);
System.out.println(ch); // prints "a"

if (operator == '+')