Thread: Help with simple math game coding

hi java programmers,

i have a simple question about my math game,
i need to randomize 2 numbers using 1 method

this is the method i have to randomize the number from 0-20

public static int addsubrandomizer ()
    {
        Random rand = new Random ();
 
        int ranaddsub = rand.nextInt (21);
        return ranaddsub;
    }

and here is where i return my data to

addsubnumber1 = addsubrandomizer ();
addsubnumber2 = addsubrandomizer ();

but i cannot figure out why they output the same number for addsumnumber1 and addsumnumber2

can someone help me figure this out please

thanks

they return the same set of numbers for both addsumnumber1 and addsumnumber2, how can i make the method to return 2 different value for each?

I'd recommend just using the math library approach

import java.lang.Math;
 
addsubnumber1 = (int) Math.floor(Math.random()*21);
addsubnumber2 = (int) Math.floor(Math.random()*21);

i posted a reply with sample and ss but need mod confirm

not sure why but i'm using Ready to Program v1.7.1

Originally Posted by JakeM1130

I'd recommend just using the math library approach

import java.lang.Math;
 
addsubnumber1 = (int) Math.floor(Math.random()*21);
addsubnumber2 = (int) Math.floor(Math.random()*21);

i will give this a try thanks

I'm on Vista and Java 1.6. Note that's not a full code though. In full, it would look something like

import java.awt.*;
import java.lang.Math;
 
public class RandomNumberGenerator {
	public static void main(String []args) throws AWTException{
		int addsubnumber1 = (int) Math.floor(Math.random()*21);
		int addsubnumber2 = (int) Math.floor(Math.random()*21);
		System.out.println(addsubnumber1);
		System.out.println(addsubnumber2);
	}
}

here was my original example code

import java.util.Random;
 
// The "SimpleRandom" class.
public class SimpleRandom
{
 
public static void main (String[] args)
    {
        int addsubnumber1 = addsubrandomizer ();
        int addsubnumber2 = addsubrandomizer ();
 
        System.out.println (addsubnumber1);
        System.out.println (addsubnumber2);
    } // main method
 
 
    public static int addsubrandomizer ()
    {
        Random rand = new Random ();
        int ranaddsub = rand.nextInt (21);
        return ranaddsub;
    }
} // SimpleRandom class

and i got both number as same

i executed many times and all of them came back the same

how would i define the Random class object outside of the method as a class variable?

G

i did the math library approach since its more efficient thx though

H

Originally Posted by javaiscool

Are you using .floor and .ceil to lower/raise each random double then type-casting to int, to ensure two different results? If so, creative. Well done!

yes i used the math.floor as jake recommended and it worked great

i have a question about checking the inputted from user
i want it to check if the user input a integer set in a range, and not allow them to input characters, symbols or words,
how could i go about doing this?

D