Die program

[sallyk57]

The questions asks write an application to roll a die and display the results. It also says let the user pick the number of sides on the die. I wrote a program Die2 which rolls a die and display the results, but i don't how to do the second part. thanks

import java.util.Random;
public class myDie
{
private final int MIN_FACES = 4;

private static Random generator = new Random();
private int numFaces; // number of sides on the die
private int faceValue; // current value showing on the die

// Defaults to a six-sided die. Initial face value is 1.

public myDie ()
{
numFaces = 6;
faceValue = 1;
}
// Explicitly sets the size of the die. Defaults to a size of
// six if the parameter is invalid. Initial face value is 1.
public myDie (int faces)
{
if (faces < MIN_FACES)
numFaces = 6;
else
numFaces = faces;

faceValue = 1;
}
// Rolls the die and returns the result.
public int roll ()
{
faceValue = generator.nextInt(numFaces) + 1;
return faceValue;
}
// Returns the current die value.
public int getFaceValue ()
{
return faceValue;
}
}



public class Die2
{
public static void main (String [] args)
{
Die myDie=new Die();
System.out.println("Rolling Die...");
myDie.roll();
System.out.println("It's " +myDie.getFaceValue());
}
}

[DeMan]

I notice that your class is declared myDie but you are trying to initialise a Die object.

public class Die2
{
  public static void main (String [] args)
  {
    myDie thisDie=new myDie();
    System.out.println("Rolling Die...");
    thisDie.roll();
    System.out.println("It's " +thisDie.getFaceValue());
  }
}
 

[sallyk57]

the program works but what does it mean to have the user pick the number of sides on the die

[DeMan]

I think it means you need to be able to adjust the program to return a random number between 1 and n (where n can be selected by the user). In reality, dice with more than 6 sides exist (for Dungeons & Dragons type games mainly). You can think of a 2 sided die as a coin (other die with less than 6 sides are hard to picture because they probably aren't possible in the real world).

Anyway, I think what they want you to do is add a method to your program to modify the number of faces (Which you already give an option for through your constructor). You have written the code well, so that such a modification is trivial (and in fact is almost identical to your constructor).

[sallyk57]

would this work

import cs1.Keyboard;
public class Die2
{
public static void main (String [] args)
{
System.out.println("Enter the number of faces you want a die to have ");
int guess= Keyboard.readInt();

myDie thisDie=new myDie();
System.out.println("Rolling Die...");
thisDie.roll();
System.out.println("It's " +thisDie.getFaceValue());
}
}

[DeMan]

I think they mean something more like :

import cs1.Keyboard;
public class Die2 
{
  public static void main (String [] args)
  { 
  System.out.println("Enter the number of faces you want a die to have ");
  int getFace= Keyboard.readInt();
 
  myDie thisDie=new myDie(getFace); //We use the other for of constructor to create a die that can cope with random numbers other than 6.  
//An eight faced die for example, a two faced die (coin).
  System.out.println("Rolling Die...");
  thisDie.roll(); 
  System.out.println("It's " +thisDie.getFaceValue());
  }
}