[Statler]

Yes. I am a beginner, and so I was hoping if someone knew how to display 10 random real numbers between 0 and 10 in Java. The problem I am having is displaying 10 different numbers generated from one Math.random statement. This is what I have so far:

public class RandomNumber {

public static void main ( String[] args ) {

double number;

number = Math.random() * 11;

System.out.println ("Here are ten random real numbers between 0 and 10:");

System.out.println (number);
}
}

[Chicon]

Just try this :

Random rnd = new Random();      
double number = rnd.nextDouble() * 11.0;

[Statler]

I tried that and I get an error:

public class RandomNumber {
    
	public static void main ( String[] args ) {
    	
		Random rnd = new Random();      
		double number = rnd.nextDouble() * 11.0;

		System.out.println (number);
    }
}

I just really want to know how to display 10 random numbers from that one single random statement. An example output would be:

5
3
5
2
7
6
7
1
9
5

[Chicon]

You forgot the import of the Random class :

import java.util.Random;

public class RandomNumber {
    
    public static void main(String[] args) {
        Random rnd = new Random();
        for (int i = 0; i < 10; i++) {
            System.out.println(rnd.nextInt(10) + 1);
        }
    }
}

[Statler]

Okay, thanks alot for the help!

[Chicon]

You're welcome !

[Statler]

Darn it. One more thing I forgot to say. Can anyone tell me how you would display random real numbers between 20 and 30 because rnd.nextDouble() seems to only work between 0 and another number.

[Chicon]

Simply this way :

Random rnd = new Random();
double val = rnd.nextDouble() * 10.0; // the command will produce a real number betweem 0 and 10 // as rnd.nextDouble() returns a value between 0 and 1
val = val + 20.0;                     // val will contain a real number between 20 and 30 // also, notice the way to write a real number : a decimal point is mandatory
                                      // to avoid the confusion with an integer 

[Statler]

Thanks again.