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Can anyone help me with this problem??

3 replies on 1 page. Most recent reply: Aug 24, 2002 5:17 AM by windels

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windels

Posts: 3
Nickname: willy
Registered: Aug, 2002

Can anyone help me with this problem??

Posted: Aug 22, 2002 8:22 AM

I want to make a program that gives me the first 50 prime numbers
( not the prime numbers until number 50),
then I have to put them in an array with length 50.
Is there some kind of method for this or is it only working with for
and if statements.

Please help me because if have a test tomorrow!!
thx

thomas

Posts: 42
Nickname: turbomanic
Registered: Jul, 2002

Re: Can anyone help me with this problem??

Posted: Aug 22, 2002 2:22 PM

public class Prime{
public static void main(String [] args){
int [] prime=new int[50];
boolean isPrime=false;
int x=1;
int counter=1;
prime[0]=1;
while(counter<50){
x=x+2;
for(int i=2;i<x;i++){
if((x%i)==0){
isPrime=false;
i=x;
}//end of if
else{
isPrime=true;
}//end of else
}//end of for
if(isPrime) prime[counter++]=x;
}//end of while
for(int j=0;j<50;j++)
System.out.print(prime[j]+" ");
}//end of main
}//end of class

//THIS IS THE ONLY WAY I CAN THINK OFF BUT
//COULD BE EASIER CHECK JAVA.MATH CLASS.

Charles Bell

Posts: 519
Nickname: charles
Registered: Feb, 2002

Re: Can anyone help me with this problem??

Posted: Aug 22, 2002 5:14 PM

Hi,

There is a well written article on generating prime numbers at:
http://developer.java.sun.com/developer/JDCTechTips/2002/tt0806.html?s=03&w=32

The newsletter at Core Java Technologies Tech Tips is very nice also. Always something there to learn.

windels

Posts: 3
Nickname: willy
Registered: Aug, 2002

Re: Can anyone help me with this problem??

Posted: Aug 24, 2002 5:17 AM

Thank you very much for your help!!
I think I had a good test!

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