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Oct 31st, 2006
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Clarity...

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hi just have a question to make sure i understand it. i'm doing the exercises in my book and it says i should create a program which will roll 2 dice and produce a random number then adds the sum of the outcomes.
Java Syntax (Toggle Plain Text)
  1. public class RollDice
  2. {
  3. /* This program simulates rolling a pair of dice.
  4.   The number that comes up on each die is output,
  5.   followed by the total of the two dice.
  6.   */
  7.  
  8. public static void main (String[] args)
  9. {
  10. int die1; //The number on the first die.
  11. int die2; //The number on the second die.
  12. int roll; //The total roll (sum of the two dice).
  13.  
  14. die1 = (int) (Math.random() *6) + 1;
  15. die2 = (int) (Math.random() *6) + 1;
  16. roll = die1 + die2;
  17.  
  18. System.out.println("The first die comes up " + die1);
  19. System.out.println("The second die comes up " + die2);
  20. System.out.println("Your total roll is " + roll);
  21.  
  22. } //end man()
  23. } //end of class
now this is all okay but when i remove the +1 there isnt any difference. i just want to know if removing the +1 will cause any problem on the program. if not...how about if i'm writing a longer program, will there be any implication?

Thanks
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mikki2 is offline Offline
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since May 2006
Oct 31st, 2006
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Re: Clarity...

if take out +1 this will generate numbers in the interval between 0-5 inclusive
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peter_budo is offline Offline
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Oct 31st, 2006
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Re: Clarity...

Thanks.
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mikki2 is offline Offline
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since May 2006
Oct 31st, 2006
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Re: Clarity...

Yeh, thats right, to be precise...
Math.random() generates a number between 0 and 1 inclusive, the chance of getting 0 or 1 is almost 0 though.
so suppose you wanted 1 to 6, first you mulitply by 6,
this gives you a number in the range 0-6, eg 5.92367236746.
Then converting to an int, will always give you either 0,1,2,3,4,5.
So just add 1, to get 1 to 6.
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cms271828 is offline Offline
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Nov 1st, 2006
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Re: Clarity...

Thanks guys. And might i add...you guys post replies quite fast! cool!
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mikki2 is offline Offline
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This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.
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