Question

i nedd to know how to fix it

import javax.swing.JOptionPane: public class Conv void length (double d) JOptionPane.showMessageDialog(null, "the equvialent cm 13 "+(double) /100) double length() double d-Double. parseDouble (JOptionPane. ShowMessageDialog(null,"enter the meter value return d*100.0: void distance (double d) JOptionPane. showMessageDialog(null,"the equvialent meter is : "+(double) /1000); double distance() double d-Double. parseDouble (JoptionPane. showMessageDialog(null, enter the kilometna return a 1000;

Answer 1

Here what I think you are doing wrong is that you are passing JOptionsPane.showMessageDialog() which is a GUI method and when you will see the docs for the method description you will get to know that showMessageDialog() has void in its return type. However, the method Double.parseDouble() expects some value which is void in this case hence the type checker is giving error. So to resolve this you must pass some value in the parseDouble() method.