Thread: Help with a calculator

I am quite new to java, I am trying to make a calculator. What i don't understand is in the last line of code says "The local variable answer may not have been initialized"? How do I initialize variable answer?

import java.util.Scanner;
public class Basic_Calculator {
	public static void main (String args[]){
		Scanner Bucky = new Scanner(System.in);
		double fnum, snum, answer = ;
		String symbol;
		System.out.println("Enter first number");  
 
		fnum = Bucky.nextDouble();
		System.out.printf("what is you second number?");
 
		snum = Bucky.nextDouble();
		System.out.println("What will you do with these numbers?");
 
		symbol = Bucky.next();
 
		if (symbol == "*"){ 
			answer = snum * fnum;}
 
			 if(symbol == "/"){
			 answer = snum / fnum;}
 
			 if (symbol == "+"){
			 		answer = snum + fnum;}
 
			 		 if (symbol == "-"){
			 				answer = snum - fnum;}			 		 
 
			System.out.printf("Your answer is: "+ answer);
			}
}

Declare that answer equals to 0.

When I run it the answer is always equals 0.

Do not compare Strings with the equality operator, "==". Use the equals() method.