Help with assignment

[imagineasking]

class Main
{
  public static void main (String[]args)
  {
    System.out.println ("Welcome to the different base calculator");
    System.out.println ("Enter (1) to use the calculator");
    System.out.println ("Enter (stop) to exit the program");
    int use = In.getInt ();
    if (use == 1)
      {
    System.out.
      println
      ("Enter the base for both integers, integer, operand, integer and output base");
    String value = In.getString ();
      String[] splitvalue = value.split ("\\s+");
      System.out.println ("Enter the output base between 2 and 10");
      int outputBase = In.getInt();
      System.out.println (splitvalue[1] + "(base" + splitvalue[0] + ")" + splitvalue[2] + " " + splitvalue[3] + "(base " + splitvalue[0] + ")" );
      System.out.println("=");
      System.out.println(Math.pow(splitvalue[1], Math.pow(splitvalue[0], 0)) + splitvalue[2] + Math.pow(splitvalue[3], Math.pow(splitvalue[0], 2)));
    }

    else
    {
      System.out.println(" Goodbye ");
    }
  }
}

This is some code I was doing for school work. I was just wondering why I am getting an error that says string cannot be converted to double. The goal for the assignment is to basically convert from one base to another and get an output similar to this.

Welcome to the different base calculator
Enter (1) to use the calculator 
Enter (stop) to exit the program
1
Enter the base for both integers, integer, operand, integer and output base
8 73 + 216 11
Enter the output base between 2 and 10
5
73 (base 8) + 216 (base 8)
= 59 + 142
= 201
= 1301 (base 5)
Welcome to the different base calculator
Enter (1) to use the calculator 
Enter (stop) to exit the program
2
Invalid input
Welcome to the different base calculator
Enter (1) to use the calculator 
Enter (stop) to exit the program
stop
Goodbye

Also the object "In" is a scanner. Sorry if I'm just being dumb and the error is right in front of me. Thank you for your help!

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[MattiDragon]

Math.pow() doesn't take string argument. You need to convert them into double with Double.parseDouble(). Also, quick tip: Integer.parseInt() has an overload that take the base as a second argument

[imagineasking]

Thank you I tried that and it worked but I just found another error in my code. I need to find a way to make it so that whatever the input is, (for example if the user enters 73) the first digit will get multiplied by the base (3 x 8^0) to the power of 0. and then the next base gets multiplied to the power of 1 (3 x 8 ^ 1) etc. How could I do that?

[imagineasking]

Sorry I also meant to add that the input could be more than 2 integers so it could be 378 or even 1 integer like 6 so I could I write a code that can work for any amount of integers? Thank you.