Reading from file double value using Scanner - InputMismatchException?

Question

I tried read from file double values and using Scanner with this aim.

It throws InputMismatchException :

\"input.txt\"  java.util.InputM         


        

Answer 1

• Initialise largest to the first double (after checking the type)

• Use the correct delimiter to parse your input (\n = newline)

  String filename = "input.txt"; 
  Scanner in = new Scanner(filename).useDelimiter("\\n");
  
  double largest;
  if (in.hasNextDouble())
      largest = in.nextDouble();
  
  while (in.hasNextDouble())
  {
      double input = in.nextDouble();
      if (input > largest)
      {
          largest = input;
      }
  }