How can I use input from user that exist inside of if statement in Java?

So what I trying to do is ask users to put their weight and score of exam 1 & 2 and if they input the score, use those variables to figure out current score. If user says do not know their score, just ignore that exam and move to the next exam. However, since scores are declared by users through scanner inside of if statement, it does not let me use those variables from outside of if statement.

import java.util.Scanner;

public class CurrentScore
{

    public static void main(String[] args) 
    {
       Scanner keyboard = new Scanner(System.in);

       System.out.printf("Weight of Exam 1: ");
       double weightExamOne = keyboard.nextDouble();

       System.out.printf("Weight of Exam 2: ");
       double weightExamTwo = keyboard.nextDouble();

       System.out.printf("Do you know your score of first exam? ");   
       String examOne = keyboard.nextLine();

       if(examOne.equalsIgnoreCase("yes") || examOne.equalsIgnoreCase("y"))  
       {
           System.out.printf("Your score? ");
           double examOneScore = keyboard.nextDouble();
       }

       System.out.printf("Do you know your score of secondexam? "); 
       String examTwo = keyboard.nextLine();

       if(answerTwo.equalsIgnoreCase("yes") || answerTwo.equalsIgnoreCase("y"))  
       {
           System.out.printf("Your score? ");
           double examTwoScore = keyboard.nextDouble();
       }

       double csEx1 = (weightExamOne * examOneScore);
       double csEx2 = (weightExamTwo * examTwoScore );
     }
}