Question

So my question is the following:
I get an error on line 12 that I want to solve but haven’t found the result for.
I use Eclipse to run and write my code.

This is what I do:

1. I write absolute
2. I enter a number with decimals

3. an error pops up saying

   Exception in thread "main" java.util.InputMismatchException
   at java.util.Scanner.throwFor(Unknown Source)
   at java.util.Scanner.next(Unknown Source)
   at java.util.Scanner.nextDouble(Unknown Source)
   at apples.main(apples.java:12)
   

How come this does not work? Also, I tried running it in CMD outside of Eclipse aswell, without sucess.

import java.util.Scanner;

class apples
{
   public static void main(String args[])
   {
      Scanner scan = new Scanner(System.in);
      System.out.println("Select one of the following(absolute,ceil,floor,max,min,power,squareroot):  ");
      String code = scan.nextLine();
      if (code.contains("absolute"))
      {
         System.out.println("Enter a number to get absolute value: ");
         Scanner num1 = new Scanner(System.in);
         double numberone;
         double numberone1 = num1.nextDouble();
         System.out.println(Math.abs(numberone1));
      }
   }
}

Answer 1

Your code is working for me if i put valid input input for your program .

If you are getting InputMismatchException means you are not providing expected input to Scanner.

double numberone1 = num1.nextDouble();

For this from your command you should give Double value only otherwise it will throw InputMismatchException