title: Java Scanner error
body: <p>I get Scanner errors when running the following code:
  How can that be?</p>
  
  <pre><code>import java.util.Scanner;
  
  public class ComputeLoan {
      public static void main(String[] args) {
      // Create a Scanner
      Scanner input = new Scanner(System.in);
  
      //Enter annual interest rate in percentage e.g., 7.25%
      System.out.print("Enter annual interest rate in, e.g., 7.25%: ");
      double annualInterestRate = input.nextDouble();
  
      // Obtain monthly interest rate
      double monthlyInterestRate = annualInterestRate / 1200;
  
      //Enter number of years
      System.out.print(
        "Enter number of years as an integer, e.g., 5: ");
      int numberOfYears = input.nextInt();
  
      // Enter loan amount
      double loanAmount = input.nextDouble();
  
      // Calculate payment
      double monthlyPayment = loanAmount * monthlyInterestRate / (1 - 1 / Math.pow(1 +     
      monthlyInterestRate, numberOfYears * 12));
  
      double totalPayment = monthlyPayment * numberOfYears * 12;
  
  
      // Display results
      System.out.println("The monthly payment is $" + (int) (monthlyPayment * 100) / 100.0);
      System.out.println("The total payment is $" + (int) (totalPayment * 100) / 100.0);
  
      }
  }
  </code></pre>
  
  <p>Console:</p>
  
  <pre><code>Exception in thread "main" java.util.InputMismatchException
      at java.util.Scanner.throwFor(Scanner.java:864)
      at java.util.Scanner.next(Scanner.java:1485)
      at java.util.Scanner.nextDouble(Scanner.java:2413)
      at ComputeLoan.main(ComputeLoan.java:10)
  </code></pre>