How To Write Random Number Generator That Will Not Contain Any Repeat Value In A Range

Apr 24, 2015

I am trying to write a Random Number Generator that will not contain any repeat value in a given range

something this I have try so far

import java.util.Random;
/**
* This class is used to generate a
* Range of Random Number in a range from int a to int b
*/
public class RandomNumberGenerator {
public static void main(String[] args) {
int[] arr=randomNummbers(1, 20);
for(int j=0;j<arr.length;j++){

[Code]...

although this code generate random numbers but some values are also getting duplicate.So how to write a program for random number that will not repeat any integer in range?

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public class printprimes2{
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  for( int i = 1 ; i <=199 ; i++ ) //iterate 1 - 199; 2 is prime {
for ( int j = 2 ; j < i ; j++ ) //iterate 2 - potential composite EXCLUSIVELY; every number can be divided by one and itself

[Code] ....

It doesn't print only prime numbers but all numbers that range from 0 to 199. What do you think I am doing wrong?

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[Code] ....

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[Code] .....

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May 13, 2011

I am trying to make a phone number generator. I get the following error though when trying to compile.

my post

C:JAVA_PROGRAMMING_CODEcode1RandomPhoneNum>javac RandomPhoneNum.java
RandomPhoneNum.java:23: cannot find symbol
symbol : method toOctalString(int)
location: class RandomPhoneNum
strippedNum = toOctalString(num1);
^
1 error

Here is the code so far

import java.util.Random;
public class RandomPhoneNum
{
public static void main(String[] args)
{
System.out.println("This app prints out a random phone number.");

[Code] ....

Also, how did you people know about octal base numbers? I would never have known that. What I can do to improve my math ability?

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[Code] ....

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import java.util.Random;

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import java.util.Random;
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[Code] ....

RESULTS:

Exception in thread "main" java.lang.Error: Unresolved compilation problems:
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at pp0303.main(pp0303.java:15)

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[Code]...

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[Code] .....

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[code]...

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