random number generator

**java3** · February 20th, 2011, 12:39 PM

I am new to java and have been asked to write a program that will generate random numbers between 10 and 20 and then stop when 18 is generated. Have been told to use a while statement and also to use Maths.Random and Maths.Round

**JavaPF** · February 20th, 2011, 01:53 PM

Hello java3,

You must of learnt the basics by now? Please create a class and show us the code you have attempted.

Show us where you are stuck and we can then go from there.

Heres some help with the while loop: http://www.javaprogrammingforums.com...ava-loops.html

**java3** · February 20th, 2011, 02:32 PM

Ok this is what I've done. Like I said I am a complete novice to programming! When I run it it just keeps generating numbers non stop.

  public static void main(String[] Args)
  {
 
 
  // int nNum;
 
 
 
    do
    {
    	int n = 10;
    	double dNum = n*Math.random(); //a random double between 0 and 10
    	int nNum = (int)Math.round(dNum); //a random int between 0 and 10
    	//System.out.println(number);
    }
    while (nNum != 8);
    System.out.println("the end");
    }
 
  }

**java3** · February 20th, 2011, 02:34 PM

I was wanting the number generator to stop when an 8 was produced

**aussiemcgr** · February 21st, 2011, 12:00 PM

Limit your base case to confirm your algorithm. Basically, your algorithm could theoretically generate numbers forever if it never returns an 8.

So, to test your algorithm, instead of a base case of nNum != 8, try something like nNum < 3. This way you have a much more narrow window for the loop continuing and if the loop breaks you can confirm that the algorithm you have for generating a random number (larger than 2) is correct. If that never finishes, then we most likely have an algorithm issue since a number being generated that is larger than 2 is much more likely than the number 8 being generated.

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