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Join Date: Jul 2005
Posts: 19
Reputation: 
Rep Power: 4
Solved Threads: 0
Newbie Poster
Hi
I have searched this site for help with this and used an example of a lottery numbers program.
However, I need to modify it slightly but can't seem to get it right.
I would like to be able to generate random numbers between 0 and 100 (maybe negative oness as well). The code below just generates 7 numbers between 0 and 6 and I can't see where I need to adjust the code. If anyone could help me with this, I would be really grateful, even just an explaination so I can work it out myself would be great as I just can't see where it is saying only use those low 0 - 6 digits! :rolleyes:
// random number generator
import java.lang.Math;
// setting up array with random numbers 26 july 2005
public class myRandomNodes {
public static void main(String[] args)
{
new ranNumbers (7);
}
}
class myRanNumbers {
private int[] numbers;
public myRanNumbers (int n )
{
numbers = new int[n];
// initialise numbers
int i = 0;
while (i < n ) {
//int r = (int) (Math.random() * n);
// create a random integer between 1 and 100 inclusive
int r = (int) Math.floor(Math.random() * 100);
if (add (numbers, i, r)) {
++i;
}
}
show_all (numbers);
}
private boolean add (int [] list, int size, int val)
{
for (int i = 0; i < size; i++ ){
if (list[i] == val) {
return false;
}
}
list[size] = val;
return true;
}
private void show_all (int[] list)
{
for (int i = 0; i < list.length; i++ ) {
//System.out.print(list[i] + " ");
System.out.println("rounded number between 0 and 100 is ");
}
System.out.println();
}
}
I have searched this site for help with this and used an example of a lottery numbers program.
However, I need to modify it slightly but can't seem to get it right.
I would like to be able to generate random numbers between 0 and 100 (maybe negative oness as well). The code below just generates 7 numbers between 0 and 6 and I can't see where I need to adjust the code. If anyone could help me with this, I would be really grateful, even just an explaination so I can work it out myself would be great as I just can't see where it is saying only use those low 0 - 6 digits! :rolleyes:
// random number generator
import java.lang.Math;
// setting up array with random numbers 26 july 2005
public class myRandomNodes {
public static void main(String[] args)
{
new ranNumbers (7);
}
}
class myRanNumbers {
private int[] numbers;
public myRanNumbers (int n )
{
numbers = new int[n];
// initialise numbers
int i = 0;
while (i < n ) {
//int r = (int) (Math.random() * n);
// create a random integer between 1 and 100 inclusive
int r = (int) Math.floor(Math.random() * 100);
if (add (numbers, i, r)) {
++i;
}
}
show_all (numbers);
}
private boolean add (int [] list, int size, int val)
{
for (int i = 0; i < size; i++ ){
if (list[i] == val) {
return false;
}
}
list[size] = val;
return true;
}
private void show_all (int[] list)
{
for (int i = 0; i < list.length; i++ ) {
//System.out.print(list[i] + " ");
System.out.println("rounded number between 0 and 100 is ");
}
System.out.println();
}
}
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Join Date: Nov 2004
Location: Netherlands
Posts: 5,752
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Rep Power: 19
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1) use code tags
2) follow the Sun coding standards, which you can get from Sun.
Doing both will make your code a lot easier to read and debug, as it stands I'm not even going to try.
2) follow the Sun coding standards, which you can get from Sun.
Doing both will make your code a lot easier to read and debug, as it stands I'm not even going to try.
As people are clearly allowed to attack me but I'm not allowed to defend myself, I no longer post to this site.
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Join Date: Jul 2005
Posts: 19
Reputation:
Rep Power: 4
Solved Threads: 0
Newbie Poster
// random number generator
import java.lang.Math;
public class myRandomNodes
{
public static void main(String[] args)
{
new ranNumbers (7);
}
}
class myRanNumbers
{
private int[] numbers;
public myRanNumbers (int n )
{
numbers = new int[n];
// initialise numbers
int i = 0;
while (i < n )
{
int r = (int) Math.floor(Math.random() * 100);
if (add (numbers, i, r))
{
++i;
}
}
show_all (numbers);
}
private boolean add (int [] list, int size, int val)
{
for (int i = 0; i < size; i++ )
{
if (list[i] == val)
{
return false;
}
}
list[size] = val;
return true;
}
private void show_all (int[] list)
{
for (int i = 0; i < list.length; i++ )
{
System.out.print(list[i] + " ");
}
System.out.println();
}
}Hope it makes it a bit easier to read - sorry about the unformatting before :-|
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Join Date: Jun 2004
Location: H4x0rville
Posts: 2,105
Reputation:
Rep Power: 9
Solved Threads: 18
Use the Random Class. It's more random than Math.random();
Be sure to add 1 if you want to reach 100.
import java.util.*;
public class RandomClassTest
{
public static void main(String[] args)
{
Random randNumGenerator = new Random();
int[] x = new int[7];
for (int i=0; i<x.length; i++)
{
x[i] = (randNumGenerator.nextInt(100)+1);
}
}
}Be sure to add 1 if you want to reach 100.
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Join Date: Jun 2004
Posts: 604
Reputation:
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Solved Threads: 6
Practically a Master Poster
Re: generating random numbers into an array.. Hi everyone,
Could not have said it better myself
Richard West
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Originally Posted by server_crash
Use the Random Class. It's more random than Math.random();
import java.util.*; public class RandomClassTest { public static void main(String[] args) { Random randNumGenerator = new Random(); int[] x = new int[7]; for (int i=0; i<x.length; i++) { x[i] = (randNumGenerator.nextInt(100)+1); } } }
Be sure to add 1 if you want to reach 100.
Could not have said it better myself
Richard West
Microsoft uses "One World, One Web, One Program" as a slogan.
Doesn’t that sound like "Ein Volk, Ein Reich, Ein Führer" to you, too?
— Eric S. Raymond
Tell me what type of software do you like and what would you pay for it
http://www.daniweb.com/techtalkforums/thread19660.html
Doesn’t that sound like "Ein Volk, Ein Reich, Ein Führer" to you, too?
— Eric S. Raymond
Tell me what type of software do you like and what would you pay for it
http://www.daniweb.com/techtalkforums/thread19660.html
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