Greetings,

I am new to this forum and programming in general, I have just started my career as a Engineer in software development 

and so far I have loved it...but I don't love the following!

I am doing some textbook exercises to hone my skills and I have come to a problem I cannot yet solve, it regarding the following code you see below, I am new to all of this so I just learned about this selective structures and Math.pow(x,y) for some reason the code works for every operation but the one in case 3, any number I enter yields this: 

And oh my god its so ugly! What kind of sorcery spawned this!? Thus I came here willing to humbly learn and ask for assistance. So any help would be VERY appreciated. 

P.D: English is not my main tongue so excuse me any typo. I have translated any relevant variables in the code, the description // is just for me.

 import javax.swing.*;

//El programa, dados datos como dos variables de tipo entero, num y v, calcula el resultado de una funcion.

 

int num;

int v;

String valor;

double val;

valor= JOptionPane.showInputDialog("Enter 1,2 or 3");

num =Integer.parseInt(valor);

valor= JOptionPane.showInputDialog("Enter V");

v=Integer.parseInt(valor);

switch(num){

  case 1: val=100*v;

          break;

  case 2: val= Math.pow(100,v);

          break;   

  case 3: val=100/v;

          break;

  default: val=0;

          break; 

}

JOptionPane.showMessageDialog(null,val);

System.exit(0);